Which of the following results in a stable population?
a. higher birth than death rates
b. equal birth and death rates
c. lower birth than death rates
d. no births while death remains constant
b. equal birth and death rates
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How many Barr bodies does a normal human female contain in each diploid cell?
A. 0 B. 1 C. 2 D. 3
Unlike plant cells, animal cells move during development. Which of the following terms describes the reorganization of undifferentiated cells that results in the formation of an embryonic structure with multiple layers?
A. blastulation B. gastrulation C. organogenesis D. cleavage
The brown tree snake in Guam had a of about 100 snakes per hectare, which is approximately equal to two American football fields.
A. population B. death rate C. population density D. growth rate E. population distribution
The type of support illustrated in the accompanying figure is a(n):
a. hydrostatic skeleton. b. exoskeleton. c. integumentary system. d. epidermal skeleton. e. endoskeleton.