What is the digestive system?
a. the body's blood-transporting system
b. the body's system for gas exhange
c. the body's food-processing system
d. the body's system of nerves

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.

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

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this