The 2 is the subscript for H symbolises the presence of 2 Hydrogen atoms.
The answer is D because ecology is the study of how the living organism effects its environment
A.Cladograms, because those are diagrams, all the rest contribute to natural selection.
33.11 km is not very far, if it was that close we would all be dead
Answer: It can decrease or increase a population of species.
Explanation: Limiting factors include the availability of food, water, shelter, and etc. When a population of species are limited in any of these, they either move or adapt to their environment. So, population tends to decrease. The population that may finds an abundance of resources will find that their numbers tend to increase. This cycle is repeated over and over again.
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