During prophase 1 of meiosis, crossing over between the sister chromatids occurs. what is the purpose of this process

Witch type of microscope is used to view very small cell components like proteins and dna?

Vessels draining the myocardium of the heart, open primarily ,into which chamber?

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.