2. The following results were obtained over a 24 hour period: Calculate (5 points for each part, 40 points total): a.) The clearance, Cx, of inulin, urea, and PAH b.) ERPF c.) The rate of urea filtration d.) The rate of urea excretion e.) The rate of urea reabsorption, given that urea is not secreted f.) The rate of PAH filtration g.) The rate of PAH excretion h.) The rate of PAH secretion (assuming no PAH is reabsorbed)

it creates acid rain

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.