Which of the following groups of individuals is at the highest risk for environmentally induced health risks? a. infants b. teenagers c. college students d. adults e. children have less outdoor exposure, making them less adapted to outside conditions f. children take more shallow breaths than adults, causing them to inhale contaminants more frequently.

In sexual reproducing animals once fertilization of the egg takes place, the exists as a single cell until cell division begins. a) egg b) larva c) sperm d) zygote

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

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?