Which of these cellular structures would be found in all living cells across all domains on earth and can indicate common ancestry?

a)chloroplastsb)ciliac)mitochondr iad)ribosomes

The answer would be Ribosomes. Cells wouldn’t be able to function properly without them.

Many prokaryotic cells don’t have mitochondria

Chloroplasts are only found in plants

Cilia aren’t in all cells

answer; ///i believe the answer is (antioxidant);

the supermassive black hole is in the middle of the galaxy.