Ranjeet is studying an unknown group of cells and finds that the cells have lysosomes. he concludes that the cell must be an animal cell. is his conclusion correct?

His conclusion is correct.

Lysosomes are cell organelles which contain hydrolytic enzymes. These enzymes are capable of breaking down biomolecules, such as proteins, lipids, carbohydrates, nucleic acid. In Prokaryotes there are no organelles, so Ranjeet’s cells must be derived from some Eukaryotes.

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.