Rearrange the events into chronological order. Place the first event to occur at the top and the last event to occur at the bottom. Gases from Earth's surface form the atmosphere.
Earth's surface cools.
Photosynthetic organisms absorb atmospheric carbon dioxide and release oxygen.
Organisms with aerobic metabolism evolve.
The composition of Earth's atmosphere changes.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

when it is at an intermediate population density