The National SAFEKIDS Campaign recommends that no child under the age of 12 be left at home alone. However, consider a child's age and maturity level. For example, if a child is extremely impulsive, it might be best to wait until he or she is older than 12.
Did people and dinosaurs live at the same time? No! After the dinosaurs died out, nearly 65 million years passed before people appeared on Earth. However, small mammals (including shrew-sized primates) were alive at the time of the dinosaurs.
Human evolution takes place during the ____________ Period of the ____________ Era. 102. Fossils that are not of the animals themselves, but of their activities, such as trails and wormholes, are referred to as ____________ fossils. 103. The ____________ were the dominant trees of the Mesozoic Era.