Using a molecular clock, scientists are able to estimate the amount of time that two species have been evolving independently.
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Plants showing hydrotropism grow in response to water.
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Answer: Its origin is not sunlight
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Answer:
Surface tension depends mainly upon the forces of attraction between the particles within the given liquid and also upon the gas, solid, or liquid in contact with it. The molecules in a drop of water, for example, attract each other weakly.
Example:
a glass of water is sitting on a table put a paper clip in it. it stays floating on the top.
Water striders can walk on water because of the surface tension of water.
Prairie dogs with established burrows
