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 DEVONIAN PERIOD (about 410 to 360 million years ago) THE FIRST LAND ANIMALS EVOLVE. The ancestry of all land animals, including the dinosaurs, can be traced back over 400 million years to the Devonian Period. During this period some animals moved to land from the water. The reason for this is that the land had food resources that had not been exploited.