Bart and Nadia are gymnasts. Their 4-year-old son, Dylan, participates in children’s gymnastics. This is an example of __________

The advent of humans' settling in places and adopting a sedentary lifestyle based on agriculture, about 10,000 years ago, allowed people to

a. specialize in various skills. c. socialize more often. b. hunt more often. d. have more children.

Babies as young as how many weeks will consistently blink as objects approach them?

A) 2 B) 4 C) 6 D) 8