How would removing the oak trees from our words affect the environment

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

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

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.