6. The molecule of which pigment is located at the reaction center of a photosystem? A. Accessory pigments C. Chloprophyll b
B. Carotenoid D. Chlorophyll a

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in

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

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs