"the human body. it is an organism. it is made up of cells, tissues, organs, and organ systems," said ms. garcia to her students. "i can see tissues, my skin! " said allie. "but how do i know i am made of cells too? " the students carried out an experiment to prove to allie that they were indeed made of cells. here is a photo of their lab activity. what did they do?

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 simmilarities and differences between anaerobic respiration in animal and yeast cells? would prefer to get simmilarities as i already got some differences. you!

9. the history of life on earth is recorded in