Student observes a cell through a microscope. She notices that it does not have a nucleus but it does have a cell wall, a cell membrane, and numerous ribosomes. Which of the following best describes the type of cell the student is observing?  * A. 
prokaryotic cell
* B. 
eukaryotic cell
* C. 
animal cell
* D. 
plant cell

A. 
prokaryotic cell

Explanation:

The cells of living organisms have been classified as either prokaryotic or eukaryotic depending on whether or not they have a membrane-bound nucleus. Prokaryotic cell are cells that do not possess a membrane-bound nucleus while eukaryotic cells possess a membrane-bound nucleus that houses their genetic material.

According to this question, a student observes a cell through a microscope and notices that it does not have a nucleus but it does have a cell wall, a cell membrane, and numerous ribosomes. Due to the fact that this cell does not have a NUCLEUS, irrespective of any other organelle it has, it is considered a PROKARYOTIC CELL.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.