Gases like oxygen and carbon dioxide move across cell membranes
a. endocytosis
b. ion channels
c. diffusion
d. facilitated diffusion

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 sre the effects of hemolytic disease of a newborn

Which of the following determines the specificity of a dna probe? a. type of radiation b. level of enzymatic activity c. number of neutrons d. complementary base pairing