Which organism would make a good bioindicator? O A. an organism that is endangered
B. an organism that is tolerant of slight physical or chemical changes
o C. an organism that has reached its carrying capacity in the ecosystem
o D. an organism that is sensitive to slight physical or chemical changes

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

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?

What will happen if two of the base pairs of the stand of the dna are switched