Why is the cell theory considered a scientific theory ?

The correct answer is theory is well-supported and established with data and can be revised.

Explanation:

A theory is considered a scientific theory when it fulfills the conditions:

1. Well-explained by facts based on the repeated experiments and observation.

2. Supported with data.

3. Can be revised or modified if needed with new discoveries and  inventions.  

Since cell theory was given by Schwann a zoologist, who observed that all animals are made of cells and Schleiden a botanist, who observed that plants are made of cells.

This theory was later supported and revised by Rudolf Virchow based on the experiments and found that all cells arise from pre-existing cells. Afterwards this theory has revised many times with the development in the technology.

Thus, theory is well-supported and established with data and can be revised is the correct answer.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).