In an ecosystem, there are many factors that affect how many organisms can survive there. which of the following is one of those factors?
a)age of mammal species
b)color of flowering plants
c)number of times humans have seen the area
d)availability of water

D) availability of water because any organisms needs water in order to survive and that’s the only factor that makes sense compared to the other answer because the age of a mammal shouldn’t matter and neither does the color of flowering plants.

D: availability of water

Explanation: In an ecosystem, water can affect how the organisms can survive because organisms caanot survive without water.

An ecosystem refers to the set of species in a given area that interact with one another and also with their non-living environments such as earth, weather, sun, soil, climate and so on. These species including plants, animals, bacteria and fungi, depend on each other. It relates to how all these different organisms live in closeness with each other and interact with another.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.