Approximately how long does it take for a sperm to develop?

The __________ will form the digestive system and the lungs

a. endoderm c. ectoderm b. amnion d. mesoderm

Shantel now realizes that Santa's sack couldn't possibly hold enough toys for millions of girls and boys, which shows that she has developed

a. animism. b. egocentric thought. c. assimilation. d. conservation.