Island species are especially vulnerable to extinction because may destroy a small island population.
A. the introduction of a new predator
B. a single event like a hurricane
C. random fluctuations in birth and death rates
D. All of the answer choices are correct.
E. the extinction of a prey species
D. All of the answer choices are correct.
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This graph shows both human birth weight and
newborn infant mortality. The most common birth weight is between seven and eight pounds. Human birth weight seems to be an example of a. directional selection. b. stabilizing selection. c. sexual selection. d. disruptive selection. e. artificial selection.
Sharks excrete a(n) small volume of dilute urine. Indicate whether the statement is true or false
Which of the following flower parts develops into a seed?
A) ovule B) ovary C) stamen D) carpel
The hormone erythropoietin acts to stimulate cells that are located in the ________ of an adult
A) spleen B) blood C) kidneys D) red bone marrow