What is meant by natural selection?
What will be an ideal response?
Natural selection means that the phenotypes in the population that are best able to secure limited resources will be the ones best able to survive and reproduce. Those that are less suited to the environment will neither reproduce nor survive as well. Populations will tend toward phenotypes that are best suited for that particular environment.
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Which pairing of nerves and functions is part of the peripheral nervous system?
a. somatic nerves; flight-fight response b. autonomic nerves; control skeletal muscle c. autonomic nerves; control internal organs d. parasympathetic neurons; prepare body for danger e. sympathetic neurons; housekeeping tasks in the body
Melvin Calvin used ________, a specific ________, to deduce the Calvin cycle of photosynthesis
Fill in the blank with correct word.
Which of the following is a structure adapted for seed dispersal by animals?
a. light, feathery plumes b. thick, indigestible seed coats c. air spaces and cork d. turgor pressure within fruits e. winged fruits
Blocking potassium ion channels in a mammalian cell membrane would __________.
A) increase the resting potential B) decrease the magnitude of the membrane potential C) decrease sodium's equilibrium potential D) increase the magnitude of the membrane potential E) increase potassium's equilibrium potential