0 7. Match the words with the descriptions. temperature
how hot or cold something is or how much heat energy an object has
units used for volume of liquids
how much matter an object has
how much space an object takes up
unit that most scientists use to express temperature
base unit for length
base unit for mass
length
how long an object is

d. planting trees

the trees take in carbon to make oxygen.

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.