Which best describes the cell theory? a)scientists know all there is to know about cells, so the cell theory will not change. b)as technological advancements are made, the cell theory may change. c)a theory, once formulated, cannot be changed. d)the development of a synthetic cell has caused the cell theory to change.

cell theory has following three postulates:

1 : a new cell is derived from the previously existing cell

2 : cells are the smallest living things,the basic unit of organization of all organisms

3: all organisms are composed of one or more cells

B) As technological advancements are made, the cell theory may change.

Explanation:

Cell theory states that cells are the structural and functional units of life. Cells arise from the preexisting cells. However, new inventions has affected cell theory in past and will continue to do so.

Example: Red blood cells are the eukaryotic cells that do not have nucleus. According to cell theory, all eukaryotic cells should have nucleus.

d statement

explanation:

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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