Invertebrates are the most commonly found fossils because they:

have hard shells which preserve well
die more often than vertebrates
are buried deeper than other organisms
secrete oxygen which petrify their bodies

Construct an explanation about the function of mitosis for multicellular organisms

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Which type of respiration takes place when there is no oxygen present