______ is a type of symbiosis in which both species benefit from the relationship.
a) mutualism
b) parasitism
c) commensalism
d) predation
Ans: a) mutualism
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An organism has one Z chromosome and one W chromosome. That organism is
A. a female bird. B. a male bird. C. a female insect. D. a male insect. E. a male or female human.
Type II survivorship curves
a. are characteristics of humans and elephants. b. typify a population in which all ages have an equal chance of survival. c. indicate a high mortality rate in the very young. d. show that very few young are produced, that each is given parental support, and that most individuals live a relatively long life and die of old age. e. are typical of annual plants.
Primary carnivores are
a. tertiary consumers in the third trophic level. b. secondary consumers in the third trophic level. c. secondary consumers in the second trophic level. d. tertiary consumers in the fourth trophic level. e. also primary producers.
The minimum temperature needed to kill all microbes in a sample within ten minutes is called the
A) thermal death point. B) essential reduction point. C) decimal reduction time. D) critical death time. E) thermal death time.