The organ that performs filtration of blood, reabsorption, and secretion in vertebrates is the _______.
A. small intestine
B. pancreas
C. liver
D. kidney
E. large intestine
D. kidney
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A production/respiration ratio of one indicates:
a. the reef is productive and exporting nutrients. b. little biomass is available for export. c. the reef may begin to decline. d. community respiration is too high. e. algae are overgrowing the coral.
The accompanying figure shows that the rate of alarm calls made by black-tailed prairie dogs is dependent on a perceived threat by a predator. This behavior most closely approximates that predicted by ________
A) mutual benefit B) selfishness C) altruism D) spite
In lakes and ponds, the open-water zone extending to the depth of light penetration is referred to as the ________ zone
Fill in the blank(s) with correct word
Structures located at the ends of eukaryotic chromosomes are called ________
A) recessive inversions B) permissive mutations C) centromeres D) telomeres E) telomerases