What is histology? the study of cells the study of the gross structure of the body the study of the tissues of the body the study of cell chemistry the study of energy production of the body?

Which direction does the energy flow in this energy pyramid ?

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?

Matched chromosomes carrying information about the same characteristics in the organism are called