If you want to double a batch of brownies you must have double the ingredients before you start cooking similarity a cell must double its contents including its dna prior to dividing

What best explains the inability for life to exist in earth early atmosphere

Describe the function of the endomembrane system? what organelles are involved?

Mattias scheiden and theodor schwann studied plant and aniaml cells under a microscope.together these men concluded that plants and aniamals are made up of cells, which scientist furthered their study to complete our mordern cell theory