During the nineteenth century, sea otters were hunted almost to the point of extinction. When the number of sea otters became very low, it was noticed that the ecosystem of kelp bed "forests" was also disappearing
It was 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. What role did sea otters perform in this ecosystem? A) competitors
B) producers
C) a keystone species
D) parasites
C
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Mendel’s monohybrid experiment results led to his
law of __________. Fill in the blank(s) with the appropriate word(s).
Polysaccharides are composed of thousands of monosaccharides arranged in straight or branched chains.
a. true b. false
A corridor with low functional connectivity for certain species undergoes
A) a filter effect. B) island biogeography. C) a strip corridor. D) an edge effect.
Which process involves the movement of molecules or atoms down a concentration gradient across plasma membranes?
A) active transport B) passive transport C) exocytosis D) endocytosis