Explain why scientists think that life on earth began after 3.9 bya

What organic molecule do plants make that is packed with electrons energized by the sun? a. glucose b. sucrose c. water d. carbon dioxide

Often, a goby fish and a shrimp will live together in a burrow the shrimp has dug in the sand. The shrimp is almost blind and therefore is unable to see predators approaching when he is outside of the burrow.

Which method is often used in the disposal of medical waste? landfill burial incineration waste exchange composting will give brainliest

Which statement best describes the composition and function of proteins in organisms?

Assume you have isolated an unknown virus. this virus has a single, positive sense strand of rna, and possesses an envelope. to which group does it most likely belong?

which object would take the most force to hold up in the air? A. a bus B. a chair C. a balloon D. a nail

In a ecological pyramid, what happens to energy, biomass and number of species as you move up? Why?

Experiment: Water Properties: Why were the results with just water so much different than the trials with the detergent?

How do fish nets effect the ocean's ecosystem?

A dog and a pig attempt to mate. we are aware that these are two different animal species. but what is the best explanation for the barrier that makes it impossible for them to successfully mate?