A squirrel population is sampled using the mark and recapture method. Scientists captured and marked 40 squirrels. The next week, they captured 20
squirrels, 10 of which had marks. What is the estimated population size?

that is a club

explanation:

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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: