What is the term for the estimated total availability of organic matter for food?
a. annual biomass production
b. above-ground biomass
c. net primary productivity
d. gross biomass volume
c. net primary productivity
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The most common neurotransmitter in the central nervous system (CNS) is _____
A) acetylcholine B) epinephrine C) glutamate D) nitric oxide E) gamma-aminobutyric acid (GABA)
What is in the outer cytoplasmic layer of radiolaria?
a. nucleus b. contractile vacuoles c. algae d. mitochondria e. gas filled vacuoles
In his study of the Mediterranean fruit flies (Ceratitis capitata), Matthew Gage (1991 ) found that ________
A) males allowed to mate alone produced 2 1/2 times more sperm than those mating in the presence of other males B) males allowed to mate alone produced 2 1/2 times less sperm than those mating in the presence of other males C) males produced the same amount of sperm when they were allowed to mate alone or when they mated in the presence of other males D) males engaged in aggressive behavior when mating in the presence of other males
Many species of snakes lay eggs, but in the forests of northern Minnesota where growing seasons are short, only live-bearing snake species are present. This trend toward species that perform live birth is an example of
A) natural selection. B) sexual selection. C) species selection. D) goal direction in evolution