"The rotating part of the microscope at the bottom of the body tube; it holds the objectives." -utahscience.oremjr.alpine.k12.ut.us
Answer:
D
) ratio of neutrons to protons in each element.
Answer:
<em>Read explanation.</em>
Explanation:
Robert Hooke defined what a cell, in other words, he gave that name to what we now know as a "cell".
How he came up with that name is simple, and doesn't involve science or biology itself. All happened when he was looking to a sample of oak bark, and saw this tiny enclosed structures, that reminded him of a cell.
Hope it helped,
BiologiaMagister
The structure is calcium ions.