Slightly fewer than 4 million babies are born in the United States each year, and the details of how, when, and where they arrive are always shifting. Total fertility rate is an estimate of the average number of births a group of women have over their lifetime. The U.S. fertility rate has been declining since 2007.
Answer:
1 : to grow by rapid production of new parts, cells, buds, or offspring.
Only unicellular orgaimns I might be wrong
