In some species, the sex of the future individual is determined by environmental conditions and not by sex chromosomes. Which species determines its sex by temperature?
a. birds
b. fruit flies
c. frogs
d. rabbits
e. zebras
ANSWER: c
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If heart rate decreases 30% and stroke volume decreases 10%, then what effect do these decreases have on the cardiac output?
A. The cardiac output decreases by 37%. B. The cardiac output decreases by 30%. C. The cardiac output decreases by 20%. D. The cardiac output decreases by 3%. E. The cardiac output decreases by 40%.
The excretory structures of annelids are referred to as
A. flame cells. B. kidneys. C. protonephridia. D. metanephridia. E. malpighian tubules.
What is the main difference between the haploid and diploid phases of animal and plant life cycles?
What will be an ideal response?
Microbes are not likely to be found in which of the following locations on human skin?
A. The stratum corneum B. Sebaceous gland C. Hair follicle D. Sensory nerve fiber in the dermis