Ecologists are concerned about amphibian populations because
A. their loss would be an aesthetic loss to the planet.
B. of the possibility of numerous medicinal uses.
C. they are keystone species in many areas—their loss will cause other populations to crash.
D. amphibians are very sensitive to environmental change—they may be indicating serious problems.
E. they are increasing to the point of competing with indigenous species.
D. amphibians are very sensitive to environmental change—they may be indicating serious problems.
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In humans, there are _______ autosomal linkage groups, plus an X and Y chromosome linkage group
A. 23 B. 46 C. 22 D. 92
A pair of cells that surrounds each stoma and controls its opening and closing are the
A. companion cells. B. guard cells. C. sieve tube cells. D. pith cells. E. vascular cells.
Melatonin is secreted by
a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the pineal gland. e. the kidneys.
A couple has four children; one is affected by SCD, and two are carriers of the disease. What can be said of the genotypes of the parents?
What will be an ideal response?