An organism living in a completely aquatic environment has several advantages: their body is supported inside and out, the current of water constantly bathes their cells and brings nutrients and oxygen while carrying away wastes, and rapid changes in temperature were prevented. when organisms moved out of an aquatic environment into a terrestrial environment, they still needed these functions performed. many of our organs/systems evolved to solve this problem and take on a specific function once provided by free water in an aquatic environment. 1. use one of the organ systems of any organism to create an analogy between it and the functions water once performed in an aquatic environment.

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.

the answer is

answer; autosomal;