Paulina is heating a test tube in a lab. which tool is she most likely using?

It changes food into energy that the organism can use.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.