Do you expect an echo to return to you more quickly on a hot day or a cold day? do you expect an echo to return to you more quickly on a hot day or a cold day? cold day. hot day. same on both days.

The answer is a cold day. This is because the air molecules are more compact during a cold day than a warm day. This because the low temperature makes the air molecules vibrate and collide at low energies. When sounds transmit through cold air, the distance between molecules is shorter than in warm air, hence  it takes less time for a molecule to 'bump' into its neighbor to transmit the sound energy.

ya the other dude is right

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.