The electron transport chain<span> occurs across the inner membrane of the </span>mitochondria<span>.
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Answer:
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<span>When a gene changes within a population over time, it is referred to as evolution. This refers to a long but steady rate of mutations that occur in genes of organisms within the environment. A lot of factors affect a population's evolution (e.g. climate, reproduction, food source) and it is a determinant whether a species will survive for the next generations. </span>
I believe it's a. hydrogen bond
The correct answer is stem cell research and animal testing.
