Answer:
Mutation. A mistake made while DNA copies which causes changes in DNA
Explanation:
Answer:
it effects the ozone which keeps out a majorty of the the suns raditon
D
Only eukaryotic cells have membrane bound organelles. Prokaryotes organelles just float in the cytoplasm.
Answer:
Excretion
Explanation:
The excretory system removes cellular wastes and helps maintain the salt-water balance in an organism. When cells break down proteins, they produce nitrogenous wastes, like urea. The excretory system serves to remove these nitrogenous waste products, as well as excess salts and water, from the body.
Start with the one that you know better the beginning of essays are hakf the tine awkward anyway.
