About what percentage of the entire existence of Earth have bacteria been alive?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells

What in scientific term why the salty popcorn causes this thirst