Which level of organization includes the most interactions?
biosphere
community
population
ecosystem

What is turgor pressure, what causes it, and what does it do for a plant?

Dna replication or repair occurs in a cell in all of thw following situations except when

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?