Select items observed by Darwin in Argentina during his journey on the H. M.S. Beagle that resulted from massive geological changes. a. Deeply eroded rivers with exposed layers of sediment.
b. Raised beaches with exposed layers of sediment.
c. Fossilized bones of extinct mammals.

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

1. desertification

2. captive breeding

3. black rhinoceros

4. renewable resources

explanation:

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