The process of involves a carrier protein that can transport a molecule across the cell membrane down its concentration gradient.

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:

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on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.