When scientists use their 5 senses to learn new information it is called

observation

Explanation:that's the answerno explanation needed

i'd say that the moon rock is about 2.2 billion years old.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's