Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?

1. Protostomes invade terrestrial environments.

2. Cambrian explosion occurs.

3. Deuterostomes invade terrestrial environments.

4. Vertebrates become top predators in the seas.

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#Question id: 11114

#Unit 7. System Physiology – Animal

The amount of air exchanged during normal quiet breathing is about:

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#Question id: 2819

#Unit 2. Cellular Organization

A typical eukaryotic gene consists of which of the following elements?

a. internal ribosome binding sites       b. introns         c. exons            d. enhancers

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#Question id: 3256

#Unit 11. Evolution and Behavior

There are three alleles, A1, A2, and A3, whose frequencies are equal abundance. According the Hardy-Weinberg equilibrium

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#Question id: 12966

#Unit 10. Ecological Principles

You are planning a dive in a lake, and are eager to observe not many underwater organisms but be able to observe them both close up and far away. You would do well to choose

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#Question id: 15220

#Unit 13. Methods in Biology

Which of the following highly sensitive analytical technique particularly useful for studying microheterogeneity in a protein