Which bases are found in a strand of Dan

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false

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?