Which of the definitions below best defines a pathogen?

a change in a cell's genetic material

an infectious agent that causes disease

a substance that increases in concentration

the influence of human beings on nature

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

What are some characteristics of a free enterprise economy?

What is true of sea slugs in these orders