Which of the following statements best describes the differences between snakes and lizards?
A. All snakes lack eyelids and all lizards have eyelids.
B. All snakes lack external ear openings and all lizards have external ear openings.
C. Some snakes are venomous and no lizards are.
D. All snakes lack limbs but all lizards have limbs.
E. None of the other choices are foolproof and combinations of characteristics are sometimes necessary to distinguish lizards and snakes.
E. None of the other choices are foolproof and combinations of characteristics are sometimes necessary to distinguish lizards and snakes.
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If the p53 gene is damaged, a cell can behave as though there are which of the following?
a. more mutations b. apoptotic mutations c. no mutations d. proto-oncogene mutations.
Annual growth rings are formed in woody stems principally through the activities of the ____
a. pericycle b. pith c. vascular cambium d. mesophyll e. endodermis
Sperm are formed directly from the maturation of
a. sperm mother cells. b. spermatids. c. spermatogonial cells. d. primary spermatocytes. e. secondary spermatocytes.
This type of plant provides nearly all of the non-meat food for the human population.
A. angiosperms B. algae C. bryophytes D. gymnosperms