Which of the following is an example of a eukaryote? a) e. coli b) amoeba c) salmonella

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

What is the correct term for an area of rotating currents in an ocean? when ocean currents combine, they create an area of rotating currents called an