Multiple choice Lake Baikal, in Russia, has more species of worms than other similarly deep and cold lakes because

a. Migratory birds introduced worms to this lake.

b. A large mammal died at its edge and worms found a plentiful food source.

c. This lake did not experience a glaciation period.

d. Worm species migrated from nearby lakes.

e. Worm species were introduced to the lake by local human populations.

it's unlikely a majority of a large population would agree on issues

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

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