Which types of macromolecules are common to both organisms and viruses?
a.)proteins and nucleic acids
b.)proteins and carbohydrates
c.)nucleic acids and carbohydrates
d.)lipids and proteins

Which process of living things produces water that enters the water cycle

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?

Which type of neuron stimulates muscles to contract?