The region composed of a presynaptic cell, its target cell, and the space between them is a

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

Coral have a symbiotic relationship with what in order to eat?

An infection of the pulp and the surrounding tissue in the mouth is called