Which cells are considered immortal?
a.) neurons
b.) blood cells
c.) cardiac muscle cells
d.) stem cells

The correct answer is option D, that is, stem cells.  

The stem cells comes under the category of undifferentiated cells, which possess the tendency to divide into unique kinds of cells. The human embryonic stem cell are regarded as immortal, as they do not age, they can multiply indeterminately, and produce any tissue of the organism. As such, they do not amass destructed proteins like the ones associated with the disorders like Huntington's or Alzheimer's.

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explanation:

because i added numbers

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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