A is your answer I believe because they do indeed provide a way to review other scientists work and or experiments
A sedimentary rock is bits of broken up rock
Cells are of two types: eukaryotic, which contain a nucleus, and prokaryotic, which do not. Prokaryotes are single-celled organisms, while eukaryotes can be either single-celled or multicellular.
Cardiac muscles as they have striations and are branching cells.
