Cell Structure crossword Puzzle
I need help on this crossword puzzle

What are genotypes? what are phenotypes?

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Plz quick a natural resource that is replaceable through a cycle in nature or sustainable practice is called a? the subject is science