What might happen if cell membranes did not have pores?

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

Someone me with this: a mineral' is determined by its actomic structure.

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs