Species richness refers specifically to the ____
a. numbers of individuals of each species present.
b. ability of larger animals to enrich themselves by successfully preying on smaller ones.
c. number of different species in the habitat.
d. feeding levels at which the animals are located.
e. relative abundance of the species
ANSWER: c
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Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle (see the accompanying figure)?
A) 1 ATP, 2 CO2, 3 NADH, and 1 FADH2 B) 2 ATP, 2 CO2, 3 NADH, and 3 FADH2 C) 3 ATP, 3 CO2, 3 NADH, and 3 FADH2 D) 3 ATP, 6 CO2, 9 NADH, and 3 FADH2 E) 38 ATP, 6 CO2, 3 NADH, and 12 FADH2
Which mechanism is the least likely explanation for high chromosome numbers in ferns?
a. dysploidy b. polyploidy c. increased independent assortment d. increased recombination rates e. homospory
Bacteroids are
a. specialized nitrifying bacteria. b. small buds from ammonifying bacteria. c. specialized bacteria that help some plant roots absorb phosphorus. d. enlarged and immobilized nitrogen-fixing bacteria. e. interactions between plant root hairs and bacteria.
Which statement reflects the age structure of these three countries?
a. India has the greatest proportion of older adults. b. The United States has the greatest proportion of young people. c. India has the greatest proportion of young people. d. China has the greatest proportion of young people. e. China has the greatest proportion of older adults.