Which cells detect changes in your body and report it back to your brain

Neurons

Explanation:

Neurons or nerve cells are the active cells in the brain that are connected with the muscle cells or other cells of the body. These cells receive the signals from the external stimulus like vision, touch, and others and convert these signals into electrical impulses that are directed to the brain and which interprets these signals and the body responds accordingly.

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.