Biology, 18.10.2019 06:10 brooklyn4932
During the 19th century, sea otters were hunted almost to the point of extinction. when the number of sea otters became very low, the ecosystem of kelp bed "forests" also declined. scientists discovered that the sea otters were predators of sea urchins, which were, in turn, predators of the kelp. when sea otters declined, the sea urchin populations grew, destroying the kelp ecosystem and the many species that depended on it. it was then understood that sea otters were in this ecosystem.
a. predators
b. competitors
c. parasites
d. a keystone species
e. producers
Answers: 3
Biology, 22.06.2019 21:40
According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this? a. this implies that dna and proteins aren't essential in cells today. b. this implies that rna can catalyze any chemical reaction that enzymes catalyze. c. this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna. d. this implies that dna and proteins evolved after rna.
Answers: 2
Biology, 23.06.2019 01:00
In what ways does a sanitary landfill differ from an open air landfill?
Answers: 3
During the 19th century, sea otters were hunted almost to the point of extinction. when the number o...
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