Which of the following statements is part of the theory?
a. only plants are composed of cells.
b. all cells are produced from other cells.
c. cells can be produced from nonliving matter
d. cells are one of several basic units of structure and function in living things.

The answer isn't here. All sites say the answer is Only animals are composed of cells. More than one site says this.
Holes I helped

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

The answer is d) by requesting advice on science internet sites