At the end of the Paleozoic Era, covered the Earth. This allowed reptiles to flourish and spread across Earth. 1. grasslands
2. deserts
3. swamps​

These traits describe either a chemical or a nuclear reaction. which statements describe a nuclear reaction? check all that apply. involves the loss, gain, or sharing of electrons may involve a change in total mass involve relatively low energy changes occur outside the nucleus involve very high-energy changes involve changes in nuclides when decay occurs