The concentration of potassium is higher in red
blood cells than in the surrounding blood plasma.
this higher concentration is maintained by the
process of
(1) circulation (3) excretion
(2) diffusion (4) active transport

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

The mammal pictured below is a silvery mole rat. which statement is an inference based on the picture? the animal is ugly. the animal has hairless feet with sharp claws. the animal has prominent upper and lower incisor teeth. the animal likely has poor vision since its eyes are so small.

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?