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.
Dinosaur fossils have been found throughout human history, but they have never been called dinosaurs or fossils. People thought they were the bones of dragons. The true inve â¦ stigation of dinosaurs began around 1840 when a woman found a large tooth in the ground.he first plants with spores, which indicates that they were land  plants, appeared in the Middle Ordovician period, about 470 million  years ago. First records of tetrapods â¦ , or land animals, show up in  the fossil record around 370 million years ago. 2 people found this useful.