A student carries out an investigation on a strain of bacteria that is used to decompose oil spills. She keeps all the solution in a lighted incubator at a temperature of 22 degree C. After three days she removes the samples and counts the number of bacteria in each. which question is the student investigating?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming