Tudy the illustration above. it depicts vertebrates at different stages of embryological development. some species are more closely related than others. which arrangement of the different phyla places the embryos in an order based on relatedness from least to most complex? a) fish, amphibian, reptile, bird, mammal b) amphibian, reptile, mammal, bird, fish c) fish, reptile, mammal, bird, amphibian d) mammal, bird, reptile, amphibian, fish

The arrangement of the different phyla places the embryos in an order based on relatedness from least to most complex is in the following order;

A. Fish, amphibian, reptile, bird, mammal.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.