Ahuman rbc is approximately 8 µm in diameter. an unknown bacterium measures 1 ocular space using the oil immersion objective compared to 2 minor spaces on the stage micrometer. a. how big is the unknown bacterium (report in micrometers) and b. how does its size compare to the rbc (how many times bigger is one versus the other)? (4pts)

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

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.

What is the meaning of endocytosis ?