How could a person acquire the disease sickle cell anemia? A by getting two affected genes from one's biological
parents

B by being coughed on by an infected person

C by coming in contact with the body fluid of an infected person

D by getting a normal gene and an affected gene from one's biological parents

a time line cause it goes from 685 to 978

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:

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.