Resistance to blood flow depends mainly on
a. the diastolic pressure.
b. elastic tissue of the vessels.
c. blood vessel diameter.
d. valves in the vessels.
e. ultrafiltration pressure in the capillaries.
C
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If you found a fish floating on the water covered with a white fuzzy material and tiny dark spheres you would suspect that the fish has been infected by a (an)
(a) diatom. (b) euglenoid. (c) water mold. (d) cynanobacterium.
Equilibrial species are shaped by ____, and tend to have a ____
a. K-selection; small body and short generation time b. r-selection; large body and long generation time c. K-selection; large body and long generation time d. r-selection; small body and long generation time
e. r-selection; large body and short generation timeWhich of the following is not a greenhouse gas?
A) N2O B) CO2 C) CH4 D) N2
A currently accepted hypothesis for gravitropism in plants is that:
A) sedimentation of organelles triggers hormone release. B) bending of leaves in response to gravity triggers growth in the opposite direction. C) microscopic eyespots trigger upward (skyward) growth. D) ground contact inhibits stem growth while air stimulates it.