According to the endosymbiosis theory, scientists believe that early eukaryotes formed from prokaryotes. why do scientists believe that prokaryotes existed earlier than eukaryotes?

a) all prokaryotes are aquatic in nature.
b) all prokaryotes perform photosynthesis.
c)prokaryotes have organelles, while eukaryotes do not.
d)certain eukaryote cell structures resemble prokaryotes.
nextreset

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

How can active reading strategies you? o a. they can you get into better physical shape. o b. they can you read fewer science articles. o c. they can you understand what you read. o d. they can you avoid reading altogether.