There is no evidence in the geologic record that multi-celled organisms of any kind existed prior to the Cambrian

Indicate whether the statement is true or false


False

Environmental & Atmospheric Sciences

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Relative to the A horizon, the B horizon of soil should have:

c a. low clay and high organic matter content b. high clay and high organic matter content c. high clay and low organic matter content d. low clay and low organic matter content

Environmental & Atmospheric Sciences

Most human ancestors (ancestors of Homo) have become extinct

a. True b. False

Environmental & Atmospheric Sciences

What kind of movement of particles is able to move against normal concentration gradients?

A) Active transport B) Diffusion C) Osmosis D) All of these choices

Environmental & Atmospheric Sciences

A vesicular igneous texture indicates that

A. the ash and pumice were hot and became compacted. B. the rock cooled slowly. C. the rock broke apart as it flowed. D. there was a lot of gas in the magma. E. the rock cooled quickly.

Environmental & Atmospheric Sciences