Darwin's theory of evolution is supported by many modern pieces of evidence. Check all that apply.
A. Human population growth.
B. Comparative studies of animal structures.
C. An understanding of the mechanism of heredity.
D. New measurements of the age of the earth.
E. Similarities in DNA of related species.
Answer: E
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Which of the following is not a characteristic of a hormone?
A. chemical messenger B. secreted from glands into the blood C. acts on distant target cells D. regulates organ systems E. secreted from glands into the interstitial fluid
Which internal defense patrols the body and can kill cancerous cells?
a. NK cells b. interferons c. lymphocytes
Four of the five answers listed below are functions of the nephrons in the kidney. Select the exception
a. filtration b. dilution c. excretion d. reabsorption e. secretion
Which cell is the most abundant in the human body?
a. lymphocytes b. basophils c. erythrocytes d. neutrophils e. platelets