The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that B) tropical regions have more available water and higher levels of solar radiation.
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Nitrogen fixation is the process where atmospheric nitrogen is converted by bacteria into biologically usable forms.
plant can not take nitrogen directly from the leaves.
See the file I attached for more information
Answer: The image at the top right corner of the page is the answer.
Explanation:
In the food web, arrows are pointed towards the consumer (not otherwise). In essence, two arrows should be pointed towards mouse, since it feeds on both algae and grass. While a single arrow is to be pointed to wolf, since it only feed on mouse.
Thus, the image at the top right corner of the page is the answer.