Which of the following pairs of vertebrate classes are most like each other? a) birds and fish b) reptiles and mammals c)amphibians and reptiles d) fish and mammals

I assume it is C) Amphibians and Reptiles, because the other choices are not very similar to each other. Also, both of these classes comprises cold-blooded vertebrate animals.

The electron has a negative charge. The electron is smaller than the other particles and can be found outside of the nucleus, which is another name for the center of the atom. In the center, there are protons and neutrons. The neutron have no charge but weigh a lot compared to the electron. The proton has a positive charge. In order to get the atomic mass, add the number of protons and neutrons together.

Explanation: