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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Which of the following is not a characteristic of carnosaurs? a. long narrow skulls b. strong forelimbs c. horn projecting from their skulls d. none of the above

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one