Milankovitch cycles select one:
a. refer to shifts in the temperature of surface water in the middle latitudes of the pacific ocean
b. are changes in earth's rotation and orbit around the sun that may trigger climate variation
c. describe the timing of the northern lights in the thermosphere
d. describe the transpiration, evaporation, and precipitation of earth's water
e. describe upwelling and downwelling in the ocean

it depends on how much it could carry.

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.