Although most of the mechanisms of evolution are nonrandom, the one that is absolutely random is ________
A) sexual selection
B) natural selection
C) artificial selection
D) genetic drift
D
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Goiter is a disease characterized by an enlarged thyroid gland. Which of the following either leads to or is an outcome of the disease?
A. iodine deficiency in the diet B. reduced levels of T3 in the blood C. reduced levels of T4 in the blood D. excessive thyroid-stimulating hormone production E. All of the choices are correct.
Predict the change in surface area and volume of a spherical cell if the diameter of the cell doubles:
A. The surface area will increase by a factor of 4, while the volume will increase by a factor of 8. B. The surface area will increase by a factor of 8 while the volume will increase by a factor of 4. C. The surface area will increase by a factor of 2 and the volume will increase by a factor of 4. D. The surface area and volume will both increase by a factor of 4.
Which hormone raises blood glucose levels?
A. glucocorticoids B. epinephrine C. insulin D. glucagon E. melatonin
Which of the following have young which feed on milk?
A. marsupials B. monotremes C. placental mammals D. placental mammals and marsupials E. placental mammals, marsupials, and monotremes