Natural selection is the mechanism that A. increases the chance of certain individuals reproducing.
B. leads to increasing variation within a population.
C. allows a weaker species to reproduce more frequently.
D. explains why populations produce more offspring than the environment can support.

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How do adaptation affect a species?

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy

Common symptoms of an iron-defiency anemia include muscle weakness shortness of breath and lightheadedness why does iron deficiency causes these symptoms