An example of natural selection is the red color of a male cardinal. the females of the species choose mates based on the
vibrant colors of the males' feathers. if females begin using different criteria than feather color when they choose mates, what
would most likely happen to the color of the male cardinals over time?
increased variation in the shades of red because the selection pressure has been relieved
increased variation in the shades of red because the cardinals try different ways to impress the females
decreased variation in the shades of red because no form of the trait is advantageous
o decreased variation in the shades of red because the only reason for variation was selection pressure

Decreased variation in the shades of red because no form of the trait is advantageous

Explanation:

Initially the selection pressure which powered the evolution of the cardinal birds was color. Now that the females do not use color to select mates, it ceases to contribute to selection pressure. No shade of red, therefore, confers advantage in the transfer of genes to the next generations. The population of cardinal birds will have more shades of red over generations.

"d.) carbon dioxide and hydrogen sulfide"

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands