A student is proposing a model to compare prokaryotic cells and eukaryotic cells. The student is using string to model the cell membrane, beans to represent the ribosomes, and pipe cleaners to model the chromosomes. How will the student need to revise the model to demonstrate a prokaryotic cell rather than a eukaryotic cell?

The pipe cleaners should be made circular to signify that prokaryotes do not have chromosomes

Explanation:

Prokaryotic and eukaryotic cells have a number of distinct features. Prokaryotes lack membrane-bound organelles, whereas eukaryotic cells are compartmentalised with different organelles performing different function.

As a result, prokaryotes no not possess a nucleus, where the DNA is housed in the cell. Eukaryoric DNA is organised into chromosomes. However, prokaryotic DNA is much more simple (and there is usually much less of it), and instead of forming chromosomes, it is organised into a singular, circular molecule, sometimes called the bacterial chromosome.

Therefore, the student will need to take one pipe cleaner and form a circle with it to make the bacterial DNA.

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.

c is the answer to this question. altitude affects the weather because air molecules evaporate.