According to the 2nd law of thermodynamics, leftover energy is dispersed into the environment in the form of heat.
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The answer which is not an example of a structural adaptation in plants is B. roots that grow in the direction of a water source.
This is the case with any plant, so it's not really a form of adaptation, whereas other options are.
Scientists do a lot of things when conducting an experiment they either collect data, stays there hypothesis, do research, publish findings. Scientists do quite a lot when they do experiments but here are some examples of what they do in experiments which are listed at the top
Downstream river would have less water, so there would be less fish to catch.
River re-routing is a process wherein the mouth of the river is mouth to another location. Thus, existing mouth of the river will lose its water source and have less water. Fishes in the existing river path will decrease because of the decreased level of water.