Annie wants to study the effect of glucose on bacterial colonies. she grows two colonies of bacteria—one with glucose present in the environment and one in an environment without glucose. categorize the statements about the experiment as either hypotheses or observations.

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

Regarding most of the narrator’s story, which word best describes the tone?

Why do we perceive objects as retaining their brightness under different lighting levels?