Which of the following best describes gravitational force? (2 points)

an attraction between two objects that have mass
an attraction between two objects due to their electrons
the force that keeps atoms and molecules bound together
the force that keeps objects from moving when they are at rest

chemical because it warmed up which involves temperature and it bubbled which includes changing

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d. organisms have cells with different shapes and functions.

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.