The cell theory is one of the unifying themes of biology. which of the following statements would be part of the cell theory?

a) the basic unit of life is the cell
b) cells come from preexisting cells
c) all living organisms are composed of cells
d) all of the above

An adult inhales about 6.0×10−4 m3 of fresh air during a breath. only 20% of fresh air is oxygen. assume the pressure in the lungs is 1.0×105 paand the air is at a temperature of 300 k. how many oxygen molecules are in each breath? a. 1.4x10^23 b. 2.9x10^21 c. 4.9x10^-4 d. 2.9 x10^25