Does anyone know the answer to this carbon-12, carbon-13 and carbon-14 are known to be different jobs or carbon true or false?

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

What do you need to use in order to work as an environmental scientist? you need to use the scientific method and__ in order to work as an environmental scientist.

How do disease caused by bacteria and disease caused by viruses react to antibiotics?