I have to submit a research project by the next few hours. Please help. What organisms are mainly used to study their mitotic stages and which cells are best used to witness the stages of mitosis.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.

density and pressure