Which describes the law of conservation of matter? A. Chemical reactions cannot change reactants into products
B. the total number of atoms cannot change during a reaction
C. a reaction has the same type of molecules before and after
D. the reactants must have more atoms than the products

Cells are adapted to preform specific functions. which of the following terms refers to this capability?

What are 3 reasons that natural selection occurs

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.