which cells are considered immortal?\nneurons\nblood cells\ncardiac muscle cells\nstem cells

Brief Explanations:

Stem cells can self - renew and differentiate into various cell types, and under certain conditions, they can have an almost indefinite lifespan, making them considered immortal in a biological sense. Neurons, blood cells, and cardiac muscle cells have limited lifespans or specific functions that do not confer immortality.

Answer:

D. stem cells