Why is the cell theory considered a scientific theory?

Because now that living organisms are made up of cells, they are the basic organizational unit of all organisms, and that all cells come from pre-existing cells

Explanation:

this website is for anybody really not just for girls just saying, also while a lot of males are mean and you know there are the few who are kind and then there's the nice-guys but then theirs also guys like me who are shy we don't get out much because there are people like you who exist who would most likely punch a guy in the face so next time just think about things before you post them to a website where guys and girls can see your question.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.