Which organism would be the least affected by the toxic mercury? a)zooplankton
b)small fish
c)larger fish
d)shark

What best explains the inability for life to exist in earth early atmosphere

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?

If a checkpoint detects damaged dna, the checkpoint may