A fire retardant is a substance that reduces flammability of fuels or delays their combustion. This includes chemical agents, but may also include substances that work by physical action, such as cooling the fuels, such as fire-fighting foams and fire-retardant gels.
These early mammals were small, insectivorous, nocturnal, hairy and warm-blooded. Warm-bloodedness is believed to have first evolved among the cynodonts, a late but successful group of mammal-like reptiles from which the mammals evolved.he Mammal-like Reptiles, or Therapsids first appeared about 285 million years ago near the begiining of the Permian which is well before the dinosaurs. They evolved quickly and many different groups arose.
The first mammal-like reptiles occurred during the Permian Period, about 300 million years ago. Primitive mammals appeared in the Mesozoic Era along with dinosaurs in the Jurassic Period, about 250 million years ago. The Age of Mammals began after the extinction of the dinosaurs and beginning of the Cenozoic Era during the Quaternary Period, about 65 million years ago. socratic Subjects