The cells of living organisms store genetic information in the form of DNA, which can be transcribed into RNA. RNA can then be translated to form protein products. The genetic code that determines the sequence of DNA nucleotides that results in specific protein products is the same for all organisms on Earth. Which of the following does this provide evidence for?
A.
All species have identical phenotypes.
B.
All species have the same number of chromosomes.
C.
All species have existed for the same amount of time.
D.
All species share a common ancestor.

D. All species share a common ancestor.

Explanation:

The genetic code is the same for all organisms and is passed on from generation to generation. So, the genetic code provides evidence that all species share a common ancestor.

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.