Thad is four. One day, his aunt asks him if he wants to go on a walk and he declines and uses a swear word. He speaks in a pleasant voice, however. Thad's mother bursts out laughing. "I wonder where he heard that?" she says. Thad's aunt says, "Isn't that precious?"

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

1. watermelon, papaya, oranges, bananas, and lemons are included in this food group. vitamin c 2. you need 6 or more servings of this food group each day vitamins d and a 3. found in fruit and keeps blood vessels healthy calcium 4. vitamins found in milk bread and grain 5. a mineral that strengthens bones fruit

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins