The amount of energy needed to start two reactants to form a product is
A. reaction energy.
B. kinetic energy.
C. activation energy.
D. potential energy.
C. activation energy.
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Three-spined stickleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets. Longer gill rakers appear to function better for capturing open-water prey,
while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish? A) directional selection B) stabilizing selection C) disruptive selection D) sexual selection
Genetic drift contributes to allopatric speciation
a. true b. false
A plant, such as an iris, that reproduces asexually most of the time probably
A) forms spores. B) is found in a changing environment. C) lacks the ability to make flowers. D) has offspring that live in the same environment as the parents. E) produces offspring that move into new environments.
Which of these is in the right order?
a. biosphere, ecosystem, cell, tissue. b. community, molecule, atom, organ. c. biosphere, organelle, molecule, atom. d. ecosystem, community, biosphere, cell.