Which describes organs in the human body?
the largest living unit
a group of cells that work together to perform a common function
a group of tissues that work together to perform a common function
Tunction
the smallest living unit

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

If your blood becomes too concentrated with iona, what will happen to the red blood cells

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?