Helen was reading about the variety of forms of aquatic organisms. she noted that plants that grow near the surface of the sea are very different from those below the surface. she concluded that the difference was because of the pressure of water on submerged plants. which is a reasonable alternative to helen's conclusion? a) the temperature increases with depth below the surface. b) only very small plants can grow below the surface of water. c) very few animals feed on plants deep below the surface of water. d) plants below the surface receive less sunlight than those on the surface.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: