Which of the following is an example of an
event that would set up the scene for primary
succession?
a. a dense landslide of mountain rocks
covering an entire valley
b. a fire that burns off all of the surface
vegetation
c. an agricultural field that is abandoned
d. a lake that dries up killing all of the aquatic
plants
e. all of these set the scene for secondary
succession NOT primary succession
A
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How would cellulose-degrading bacteria in the rumen (stomachs) of a cow benefit the animal?
A. The bacteria would produce, secrete, and incorporate organic molecules as they obtain energy from the cellulose in grass and replicate. The cow could then digest both the secreted organic molecules AND the bacteria that synthesized them. B. The bacteria would produce sugars as they digested the cellulose. These sugars would be given off to the cow as a symbiotic relationship in exchange for the protected location of the stomachs of the cow for the bacteria to grow and replicate in. C. They wouldn't benefit the animal-they would replicate and cause disease in the animal, leading to its death. D. They wouldn't benefit the animal-only the bacteria within the animal. This is why cows must have food sources other than grass in order to survive.
Which of the following does NOT have an exoskeleton?
a. lobsters b. spiders c. insects d. earthworms e. centipedes
Why don't recessive alleles that cause severe disorders disappear from human populations?
a. new alleles can arise by mutation. b. in heterozygotes, the dominant allele suppresses the recessive one but does not eliminate its presence. c. in heterozygotes, although the trait associated with the recessive allele is not demonstrated, the allele may be passed on to offspring. d. some recessive traits are not lethal nor do they interfere with reproduction. e. all of these.
Generally speaking, fluids in plants are
A) pushed through phloem with a pressure gradient and pulled through xylem. B) pushed through xylem with a pressure gradient and pulled through phloem. C) pulled through both xylem and phloem. D) actively pumped throughout the plant.