Presently, it is thought that organic polymers may have formed and accumulated on:

a. silt and sand.
b. sand and mud.
c. rocks and clay.
d. water and shells.
e. sand and heavy metals.


c

Biology & Microbiology

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The Dust Bowl of the 1930s was the result of

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The base of the detrital food chain is formed by

A) primary producers. B) decomposers. C) herbivores. D) dead organic matter.

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The formation of carbonic acid in the oceans directly results in

A) increased sea surface temperatures. B) inhibition of shell growth in marine animals. C) increased marine biodiversity. D) increased pH.

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What is typically the first step in the scientific method?

A) Experiment B) Hypothesis C) Prediction D) Observation

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