Which of the following is a true statement about simple diffusion? occurs from a high to a low concentration.
occurs from a low to a high concentration.
O moves large particles into or out of the cell through a protein channel
requires energy to move substances.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above