What traits do archaeans and bacteria share?

These are both  microscopic, unicellular organisms of no cell organelles; that is they lack the basic organelles of cells like the mitochondria, endoplasmic reticulum, nucleus etc.Their genetic materials are conserved in a single circular chromosomes, unlike in eukaryotes where they are packed   in nucleus. Other similarities are:

Both  are Prokaryotes.

They both lack nucleus

They both lack membrane bound organelles.

They both undergo reproduce asexually by  binary fission.

Both also have plasma membranes.

Explanation:

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.

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.