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.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."