Step 1: Three hundred trout are needed to support one man for a year. The trout, in turn, must consumer 90.000 frogs, that must consume 27 million grasshoppers that live off 1,000 tons of grass.-G. Tyler Miller, Jr.
American Chemist (1971)
1. What is your reaction to the scientists statement above?

the answer is:

carbon dioxide

i got you i did it ya know what it is just needing to fill this in for a quick task!

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.