Which description best describes the cell wall of a gram-positive bacteria?

What are some characteristics of a free enterprise economy?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

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