Uracil is the nitrogen base only in rna
Answer:
Digestion
Explanation:
The breakdown of foods into forms that can be transported to cells and absorb into these cells(this process has two parts): Mechanical(breaks down large pieces of food into smaller ones) and Deglutition(swallowing).
All cells have selectively permeable membranes, which means that they let important molecules inside the cell while leaving other ones outside. Important molecules go inside the cell by the process of diffusion or osmosis.
<em>Electron microscopes use a beam of electrons rather than visible light to illuminate the sample.</em>