To warm up before a run, david begins by completing quad and hurdler's stretches. which of these accurately evaluates his choice of warm-up activities? a ) these activities are appropriate because they prepare muscles for intense movement. b)these activities are not appropriate because the muscles stretched are not warm yet. ] c) these activities are appropriate because they make the leg muscles more flexible. d)these activities are not appropriate because they stretch muscles not used in the exercise.

b is the best answer for this question.

b is the correct answer

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.