Question

When we frame question with simple past tense, which of the following words to be used? *
a. Do
b. Did
c. was
d. Does​

Answer 1

Explanation:

Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. ... Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell.

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