The surface tension of water molecules explains how some insects can walk on water.
Surface tension is a property of liquids that occurs because of the cohesive forces between molecules at the surface. In the case of water, each molecule is held to the surrounding molecules by strong hydrogen bonds. These cohesive forces are exerted in all directions on molecules in the center of the liquid.
However, molecules at the surface experience the force only from the sides and below, which pulls them more closely together and creates a 'surface film' that is harder to break. This surface film allows small, lightweight insects, like water striders, to walk on water.
They distribute their weight over a larger area, which prevents them from breaking through the surface tension and sinking. Essentially, they take advantage of the strong intermolecular forces at the surface of the water to support their weight.
As a plant grows, the stem often becomes thickened and somewhat woody since it is responsible for supporting the upper branches and leaves. Cells in this area of the plant develop
thickened cell walls
Cells in the stem, needed for support, develop thickened cell walls. These specialized cells are called collenchyma cells.
How does brandt define literacy sponsor? what are the characteristics of a literacy sponsor?
The amygdala is the brain region that is most often called into action under situations of
Which psychiatrist believed the environment was more important to a child's intellectual development than biology? A. B. F. Skinner B. Jean Piaget C. Lev Vygotsky D. Sigmund Freud
Lev Vygotsky believed the environment played a key role in a child's intellectual development, emphasizing cultural and social factors as pivotal in the learning process.
The psychiatrist who believed the environment was more important to a child's intellectual development than biology was Lev Vygotsky. While other theorists, like Jean Piaget and Arnold Gesell, acknowledged the role of biology to some extent, Vygotsky emphasized the cultural and social factors as crucial elements in cognitive development. Unlike B. F. Skinner, who focused on behavioral aspects, or Sigmund Freud, who focused on psychoanalytic aspects, Vygotsky's theory posited that children learn actively through hands-on experience and that their learning is inherently a social process. Therefore, the knowledge they gain is greatly influenced by the culture and environment in which they are raised.
A measure of the amount of output produced by a given amount of inputs in a specific period of time is the definition of
A) allocation.
B) productivity.
C) opportunity costs.
D) equilibrium price.
Do you find Dr. Natterson-Horowitz's argument that physicians can learn a lot from veterinarians convincing? What part of her argument is, to you, especially strong or weak?
which stem cells are capable of only limited differentiation
Ans.
Stem cells are those cells, which have ability to divide and develop into specialized cells in the body. Stem cells can be found in embryo (known as embryonic stem cells and in adults (known as adult stem cells).
Embryonic stem cells are pluoripitent cells having capability to develop into any cell type. Adult stem cells can differentiated into only limited cell types. For example, hematopoetic stem cell that can form only different types of blood cells.
Thus, the correct answer is 'adult stem cells.'
1. Explain how human activities can cause an imbalance in biogeochemical cycling and lead to problems such as cultural eutrophication and fish kills
Human activities that majorly impact the biochemical cycling are pollution through extraction of fossil fuels. The burning and use of these fuels also impacts the whole process of the cycling. Causing the processes to occur rapid disrupting the whole cycle. As far as Cultural eutrophication goes the pollution created by the use of fossil fuels and also the use of fertilizers are then put into our water system. The water then inevitably goes into our lakes and streams causing mass fish kills and water pollution.
2. Heavy metals that pose health hazards to people and ecosystems occur __________. a. as a by-product of agriculture b. over extended periods of time c. very quickly with tragic results d. all of the above
Answer:
Many of these substances, when eaten, cause serious health problems over time.
Explanation:
yep
Binary fission is a type of cellular reproduction in which a cell divides into
Two identical copies of itself - Apex :)
Which tools measure the volume of liquid? Check all that apply.
a graduated cylinder
a meniscus
a pipette
a beaker
an electronic balance
a caliper
Answer: a graduated cylinder, a pipette , a beaker
Explanation:
The volume of the liquid can be define as the space that a liquid acquires in rest or in a container. It depends upon the shape of the container. It is expressed in terms of cubic centimeters, liters and milliliters.
Among the options given, a graduated cylinder, a pipette and a beaker can be used for measuring the volume of the liquid. This is because of the fact that all of them exhibit a scale on their outer walls which helps in measuring the accurate volume of the liquid poured in the instrument.
According to descartes what do animals and the human body have in common
According to Descartes, animals and humans have things in common and the things that they have both in common in which he had noted is the structures that they have in their body such as having blood, spirit, nerves, muscles, bones and other organs. He also adds that they have movements in which both they have in common.
Which type of bond ensures that the transfer rna is in the correct position over the codon during translation?
Which four elements are the primary components of important biological molecules, such as proteins, carbohydrates, and lipids?
how would you collect accurate and precise crocodile nest data?
To collect accurate and precise crocodile nest data, researchers can use the mark-recapture method along with GPS tracking, and employ non-invasive techniques like camera traps and DNA analysis from collected fecal samples. Establishing random sampling points and using reliable data sources alongside flagging for marker placement are key for obtaining consistent and unbiased data.
To collect accurate and precise crocodile nest data, biologists can employ several methods. The mark-recapture method is a technique where crocodiles are captured, marked with a permanent marker, and then released. The use of GPS coordinates is essential to mark sample points and ensure consistency in the data collection process over time. Non-invasive techniques, such as camera traps and DNA analysis from fecal samples, can also provide valuable information about crocodile populations without physically disturbing the nests or the crocodiles.
It is important to randomly select sampling locations using a random numbers table, ensuring the data is not biased by predetermined choices. Biologists can use a compass to find a bearing and walk a randomly selected distance to establish these sampling points. At each point, detailed habitat data is collected, and then the process is repeated multiple times across various locations.
Additionally, permanent marking of sampling locations with flagging or other markers, while being aware of the potential influence on the environment or the wildlife being studied, is a crucial step towards consistency and reliability in the data collection process. Moreover, combining different methods and cross-verifying data with reliable sources is essential to avoid potential biases and enhance the quality of the data collected.
A substance that yields a cation plus the hydroxyl ion in water is a(n)_____.
salt
acid
base
Two pairs of arteries supply the brain. they are: ________.
The two pairs of arteries that supply the brain are the anterior communicating artery and the posterior cerebral arteries.
Explanation:The two pairs of arteries that supply the brain are the anterior communicating artery and the posterior cerebral arteries. The anterior communicating artery is an anastomosis of the right and left internal carotid arteries and supplies blood to the brain. The posterior cerebral arteries form part of the posterior portion of the arterial circle, also known as the circle of Willis, and supply blood to the brain.
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Our customers dogs have many different dietary needs, such as low-protein foods for kidney disease, and some of our customers simply prefer special diets like all-meat foods. therefore, we order food from a lot of vendors. how can we make sure we always have enough of the right food on hand and get the best prices?
Hydroelectric power produces electricity using ____.
a. Tidal movement
b. Pressurized
c. Falling water
d. Geothermal
Hydroelectric power produces electricity using falling water. Hence, option (c) is correct.
What is Hydroelectric power?hydroelectric power is a type of energy that uses the force of moving water to produce electricity, such as water running down a waterfall. This force has been utilized by people for ages.
The majority of hydroelectric power plants feature a water reservoir, a gate or valve to regulate the amount of water that flows out of the reservoir, and an outlet or location where the water ends up after flowing downstream. Just before water rushes over the top of a dam or cascades down a hill, it gains potential energy. Water flowing downhill changes potential energy into kinetic energy. When a turbine's blades are turned by water, electricity is produced and sent to the power plant's users.
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A bone that contains a diaphysis and epiphyses, a tuberosity near its proximal end, and proportionally more compact than spongy bone is the ________. radius first rib talus clavicle fibula
The bone being referred to in the question, which contains a diaphysis and epiphyses, a tuberosity at the proximal end, and is mainly composed of compact bone, is the radius. The correct answer is radius.
The bone described in the question, a bone that contains a diaphysis and epiphyses, a tuberosity near its proximal end, and is proportionally more compact than spongy bone, is most likely the radius.
The radius is a bone in the forearm that has these characteristics. The diaphysis is the shaft or main part of the bone, while the epiphyses are the end parts.
Proximally, the radius often has a rounded region known as a tuberosity. The radius also tends to have a greater proportion of compact bone than spongy bone.
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Final answer:
The bone mentioned, characterized by having a diaphysis, epiphyses, a proximal tuberosity, and a composition mainly of compact bone, is the long bone known as the radius.
Explanation:
A bone that features distinct structural components such as a diaphysis, epiphyses, a tuberosity, and a composition predominantly of compact bone corresponds to a long bone in the human body. The diaphysis is the long tubular shaft situated between the proximal and distal ends of the bone, while the epiphyses, which are the rounded ends, are found at each end of the bone and typically filled with spongy bone and red marrow. In this case, where a tuberosity is near the proximal end, and there is a larger proportion of compact bone relative to spongy bone, the correct answer identifying the bone described is the radius.
The radius is one of the long bones in the human arm, partnered with the ulna, and is essential for the forearm's range of movement. The structural hallmark of the radius that sets it apart from other bone options listed - such as the first rib, talus, clavicle, or fibula - is its significant amount of compact bone and the presence of a tuberosity near the proximal end, which aligns with the characteristics mentioned in the question.
This is the study of biological inheritance.
The study of biological inheritance is known as Genetics. It involves the study of genes, DNA, hereditary patterns, gene distribution, variations and alterations in populations.
Explanation:The study of biological inheritance is known as Genetics. Genetics is a sub-discipline of biology which deals with how traits and characteristics are passed from parents to offspring through genes. It includes the study of DNA (deoxyribonucleic acid), which is the molecule that carries genetic information in all living organisms. It also involves the understanding of hereditary patterns, gene distribution, variation, and the alterations within populations over time.
e study of biological inheritance. It focuses on the principles of genetics and how traits are passed down from one generation to another. Inheritance is determined by genes, which are segments of DNA that code for specific traits. These genes can be inherited from both parents and can result in a variety of genetic variations.
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Which of the following accurately describes the relationship between photosynthesis and cellular respiration
In which direction does a reverse fault cause the land to move? up down left right
Suppose that a patient is diagnosed with new disease caused by build up by the waste material in the body's cells which organelle is most likely malfunctioning in patients cells
Psychologists need to decide how they will the phenomenon they are interested in so that they can describe that phenomenon
Matching: Match the trace element with the function.
A. Magnesium B. Iron C. Zinc
____ 11. helps hemoglobin carry oxygen
____ 12. part of the enzyme that maintains acid balance in your stomach
____ 13. found in chlorophyll
As the ________ of the environment increases, the resources become hard to obtain.
i need a riddle for physics
Salty snacks like peanuts and pretzels can often be found for free at gatherings where beverages are for sale. Vendors hope that the salty snacks will make consumers thirsty so they will purchase something to drink. Why does this work?
A lily plant on a pond is an example of which food chain level? A. primary consumer B. decomposer C. producer D. 3rd tier consumer