According to Darwin’s tree of life the branches represent the idea that A) total number of species decreases over time
B) total number of species increases over time
C) most species go extinct
D) both A&B
E) both B&C

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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 three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.