Viruses differ from prokaryotes in which way? a: viruses requires a host for growth and reproduction b: viruses contain membrane bound organelles c: prokaryotes are not considered living d: prokaryotes contain membrane bound organelles

Answer is A: Viruses requires a host for growth and reproduction.
Viruses are not considered as organisms because they are not made of cell or cells. They made of nucleic acid (DNA or RNA) and protein. Viruses do not have their own energy producing system, they uses host energy for their growth and reproduction. Without host they can't do any thing. They are connecting link between livings and non-livings.

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.