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
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Most human ancestors (ancestors of Homo) have become extinct
a. True b. False
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
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.
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