After she explains commensalism to her friend, Hailey tries to think of an example of it. Which of the following is an example of commensalism? fleas and and a dog

barnacles on a whale

a human and chicken pox

a bee and a flower

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol

What happens to isotopes that are unstable?