The system is made of a series of glands that release chemicals directly into the bloodstream?
a. nervous
b. endocrine
c. digestion
d. skeletal

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

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Which statement names a physical property of wood? wood does not rustwood can burnwood can rotwood is softer than coal