Homologous traits are found in two or more species because . a. those traits are from a common ancestor. b. Both of the other answers are correct. c. some evolutionary process (usually natural selection) has independently fashioned similar traits in each species.

The correct answer is a. those traits are from a common ancestor.

Explanation:

Homologous structures are the structure that may be superficially different or may do not share the same function but they are developmentally related to each other because homologous structures are derived from a common ancestor.  

For example, wings of bats and forelimbs of birds are homologous structures which means they share a common ancestor. Divergent evolution is responsible for producing homologous structures. In divergent evolution, related species become more dissimilar. Therefore the correct answer is a.

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.