As fluid moves through a vessel, which factors determine the flow resistance? Select all correct choices
A. the viscosity of the fluid
B. the length of the vessel
C. the radius of the vessel
D. the pressure exerted by the heart
A,B,C
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When all vegetation is removed from a site by human activity or by natural forces such as volcanic activity, ________ species are the first to recolonize the site
Fill in the blank(s) with correct word
Stromatolites are ________
a. mineral features in caves that extend downward from the ceiling b. the earliest type of seed plant c. mat-like remains of bacteria found in extinct hydrothermal vents d. dome-shaped, layered structures formed by photosynthetic bacteria
Which of the following catalyzes biochemical reactions?
a. Enzyme b. Glucose c. Substrate d. Protein
A biologist studied a population of squirrels for 15 years. During that time, the population was never fewer than 30 squirrels and never more than 45. Her data showed that over half of the squirrels born did not survive to reproduce, because of both competition for food and predation. In a single generation, 90% of the squirrels that were born lived to reproduce, and the population increased to 80. Which inference(s) about this population might be true?
A. The amount of available food may have increased. B. The parental generation of squirrels developed better eyesight due to improved diet; the subsequent squirrel generation inherited better eyesight. C. The number of predators that prey upon squirrels may have decreased. D. A and C could be true. E. A, B, and C could be true.