<span>C. metric ruler since millimeters are metric</span>
An isotope of any element is the same, with a variation in the neutrons of the nucleus.
The mass number change but the atomic number doesn't.
In this case, protium, deuterium, and tritium are all hydrogen isotopes.
Protium is 1H or Hydrogen-1 is without neutrons.
Deuterium is 2H or Hydrogen-2 has one neutron.
Tritium is 3H or Hydrogen-3 has two neutrons.
Answer:Connective tissue integrates the various parts of the body and provides support and protection to organs. Muscle tissue allows the body to move. ... Different types of tissues form membranes that enclose organs, provide a friction-free interaction between organs, and keep organs together.
Explanation:
<span>http://www.geosociety.org/science/timescale/timescl.htm
The geologic time scale is organized based by major geological events.
</span>
Its the epidermis because it is subdivided into two layers.
