Half of an individual's DNA sequence is combined with the other half during the
process of

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

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?

Pulmonary arteries carry highly oxygenated blood. true or false?