What process provides a vital connection between the sun and the energy needs of living systems

An adult who follows a 2000-kcal healthy u.s.-style eating pattern should consume ounce-equivalents from the protein foods group per day.

At which location in earth’s interior does the top density continue to increase as thickness decreases?

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?