8
pilohippus
merychippus
mesohippus
eohippus
equus
(modem horse)
(dawn horse)
give two similarities between each of the skulls that might lead to the conclusion that these are all related species.

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.