Polar bears are top predators, and tests on their tissues have shown a surprising ____
a. resistance to warming
b. amount of protein
c. resistance to disease
d. amount of mercury and organic pesticides
e. amount of nutrients
ANSWER: d
You might also like to view...
When several possible phylogenetic trees can be produced from a data set, the most parsimonious tree:
A. is the one that shows the smallest number of evolutionary changes. B. is the one that shows the largest number of nodes. C. is the one that shows the largest number of analogous characteristics. D. is the one that shows the smallest number of synapomorphies. E. is the one that shows the smallest number of branches.
Each hemoglobin molecule carries ______ oxygen molecules.
A. 1 B. 2 C. 3 D. 4
Males tend to be affected in greater numbers by Xlinked
recessive genetic disorders than are females because a. females have two dominant genes for the disorder. b. males have only one X chromosome. c. males have a double dose of the gene. d. Y chromosomes are not as strong as X chromosomes. e. none of these.
Which of the following is a trigger for the other actions described?
a. Extracellular fluid volume is reduced. b. Solute concentration in the extracellular fluid rises above a set point. c. Posterior pituitary secretes ADH. d. Distal tubules of the nephrons and the collecting ducts become more permeable to water. e. A small amount of concentrated urine is excreted