Kristen cut her hand on a piece of glass. as the blood clots, how do white blood cells prevent bacteria on the glass from infecting her blood?
a. they bring more oxygen to the site for repair.
b. they destroy pathogens that enter the wound.
c. they form the platelet plug.
d. they cause blood vessels to constrict.

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

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 true of sea slugs in these orders