Why do scientists believe that the earliest life forms most likely lived in the oceans? chemicals could not react to form complex molecules without water. early earth did not have an ozone layer. the land would have been too cold for life to form there first. all life relies on water.

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a.positive force, balanced force, negative force b.negative force, balanced force, positive force c.positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force