Crossing over is a very important event in prophase i of meiosis! what happens during crossing over and what is the significance?

How had the study of mitosis affected scientists knowledge of cancer

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

Which is the function of the hypothalamus in thermoregulation? answers: -sensor -effector -stimulus -intergrating center it's either a or c i believe