A ____ species affects other members of the community in ways that are disproportionate to its abundance or biomass
Fill in the blank with the appropriate word.
keystone
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Lizards that eat flies they catch on the ground and birds that catch and eat flies in the air are engaged in _____ competition
a. exploitative d. interspecific b. interference e. both exploitative and interspecific c. intraspecific f. both interference and intraspecific
cIn the spiral staircase model of DNA, the handrails
are a. covalent bonds. b. hydrogen bonds. c. nucleotide base pairs. d. phosphate and deoxyribose groups. e. composed of all of these.
The first reptiles were the sail-back
A. dinosaurs. B. therapsids. C. pelycosaurs. D. thecodonts.
A population's age structure tracks
a. the average age of the members of the population. b. how long the population has existed in the area. c. the rate at which the population is aging. d. the relative numbers of each age.