There’s many things that are not necessary. The things that are would be food water some sort of shelter and a working body, I think you can go from there. Sorry if that’s not what your looking for. Hope it helps though! ♥️
A. slow down as a response to the cooling temperature
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The theory of evolution says that all creatures began as unicellular organisms.
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Answer:<u><em>In the natural world, limiting factors like the availability of food, water, shelter and space can change animal and plant populations. Other limiting factors, like competition for resources, predation and disease can also impact populations. ... Other changes in limiting factors will cause a population to decrease.</em></u></h3>
Explanation: