One purpose of the Environmental Protection Agency (EPA) is to regulate hazardous wastes. There are many types of wastes that can be dangerous to the environment. They include waste produced by hospitals, dry cleaners, auto repair shops, and exterminators. The EPA makes rules to ensure that these wastes are disposed of property. if wastes from community businesses are not disposed of in the right way, they can end up- A entering the atmosphere and causing acid rain that will käl forests around the country.

B. contaminating the sol and causing runoff to flow into bodies of water that supply humans with food

C. causing serious pollution

D. causing landfills to overflow.

some scientists like gregory adcock agree with thorne's theory of regional continuity.

others, like chris stringer and ian tattersall, believe thorne's results may be contaminated or misinterpreted.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.