Human pollution of oceans threatens the growth of algae and other protists that live there. The loss of these microscopic organisms most likely affects the health of the environment and its ability to support life because these organisms are the beginning of food chains

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.

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