Which of the following is an accurate mathematical expression of dalton's law? assume the variable ‘p' stands for pressure.

a. ptotal = p1 + p2
b. ptotal = p1 x p2
c. ptotal = p1 ¸ p2
d. ptotal = p1 + p2 x p3

Dalton's law of partial pressures states that the total pressure of a mixture of gases is the sum of the partial pressures of its components:
\text {P}_{\text{Total}} = \text P_{\text {gas 1}} + \text P_{\text {gas 2}} + \text P_{\text {gas 3}} ...P
Total
=P
gas 1
+P
gas 2
+P
gas 3
...

It made it possible to actually see cells.

Explanation: With the development and improvement of the light microscope, the theory created by Sir Robert Hooke that organisms would be made of cells was confirmed as scientist were able to actually see cells in tissues placed under the microscope.