Homeostasis is the process by which organisms keep internal conditions relatively constant<span> despite changes in external environments. Homeostasis in the body is maintained by feedback loops.
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The answer is D. id be more than happy to explain if you like
Tundra is flat, barren-like land whereas a tropical rainforest is a vast, more complex environment. Due to this, tundra provides less habitats for organisms to live in than the rainforest. This means that a greater variety of species are able to co-exist in the rainforest than in tundra, so species diversity is greater.