Arya is writing a research paper about physicist Milutin Milankovitch. Help Arya complete the following paragraph of her esse Milutin Milankovitch was an astrophysicist who was famous for his revolutionizing theories that helped us better understand our climate.
He explained how the concepts of obliquity, eccentricity, and precession affect the amount of heat Earth receives. Milankovitch also
explained how this heat affects the climate on Earth. The term obliquity refers the
of Earth's axis. Eccentricity (e)
describes how circular Earth's orbit is. If e=0, the seasonal changes on Earth would be
v. Precession
explains the of Earth's axis as it traces an Imaginary circle, which affects Earth's solstices over time.
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explanation:

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

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.