The embryos of a fish, chicken and rabbit all contain a tail and pharyngeal pouches at some point during their early development. although the fetus of all these species looks different from one another, the similiarity between these organisms during their embryological development suggests an evolutionary relationship among all species. a) avian b) invertebrate c) mammalian d) vertebrate

All of the animals listed are vertebrates and as for all of the other choices, not all of them fit the description. So the correct answer is D) vertebrate.

The correct answer is option D which is vertebrate.

Explanation:Vertebrates are the group of animals which all contain the backbone and some structural feature of the embryonic stage like the pharyngeal pouches and a tail.The embryonic feature is some primitive organs of an animal which is going to make the specific organ in later life.Here all given animals are vertebrates. As fish, rabbit, and chicken have the characteristic of vertebrate animals.Hence the correct option is D.

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass