Another lab value monitored routinely is the total red blood cell (rbc) count. a normal rbc count is typically 4.2-5.9 million/mm3. having a low rbc count is called anemia. predict the possible effects of having anemia, considering the functions of erythrocytes

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

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2