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.
Primate Evolution. This week we will shift our focus from the present to the past. Weâre going to see how primates evolved from a primitive mammal form to the ape or hominoid forms that are ancestral to our lineage. This is going to cover a huge time span--about 65 million years ago (mya) to about 6 mya. Primate evolution will lead to our next major area which is human evolution.