The change in environments that may have occurred at the end of the paleozoic era may have been caused by
a. mass extinctions
c. plate tectonics
b. evolution of the dinosaurs
d. the beginning of an ice age

The correct answer is C. Plate tectonics.

The change of environment which might have occurred at the end of paleozoic era are caused by plate tectonics.

Tectonics plates is termed as scientific theory which describes large-scale motion where there is movement of seven large plates of larger number of small plates of lithosphere in earth.

The model of tectonic plates builds concept of continental drift. Lithosphere is the outermost shell which is found in planets and it is broken down into tectonic plates which are then composed of continental lithosphere and oceanic lithosphere.

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.