In which environment would primary succession occur?

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 would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?

The mixture of sperm and fluids from the seminal vesicles, prostate gland, and cowper's glands is called