When two separate species have body structures such as specific bones that are the same but the two species are very different these structures are known as?

Homologous structures are structures (body parts/anatomy) which are similar in different species because the species have common descent. They may or may not perform the same function. An example of homologous structures is the forelimb structure shared by cats and whales.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101