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.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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because the light is a great source of energy for the plants to survive. (i hope this )