Explain the difference between direct and indirect observation in determining population size.

Direct Observation The most obvious way to determine the size of a population is to count all of its members.

Ex. Counting all of the crabs in a tide pool.

Indirect Observation Sometimes it is easier to observe signs of organisms rather than the organisms themselves.

Explanation:

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i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.

increases the risk of extinction 

explanation:

the answer is that if the species suffers from the disease, there is nothing stronger than the others, so it is possible to remove wholeness. an example of this is hunger in irish potatoes, which has a deadly disease bearish part of all potato harvest masses. pretty much ruins the land of crops.