Match the era on the left with its characteristic on the right. Mesozoic
?
When Earth formed
Precambrian
?
The age of dinosaurs
Cenozoic
?
When most of our
limestone and coal
formed
Paleozoic
?
The era of humans

Structures in cells that carry out specific functions.

What did the first language sound like

Listed in the item bank are some key terms and expressions associated with the categories seen in the venn diagram. to find out more information about items, some have more details available when you click on them. drag and drop each item onto the proper area of the diagram. if an item describes more than one category, be sure to place it in the overlapping space. viruses are tiny infectious pathogens that cause many different diseases, such as polio, and the flu. though they are similar to one celled organisms in some ways, in many ways they are very different. use the venn diagram below to show the similarities and differences between viruses and living organisms.