Answer:
The very bottom one
Explanation:
Thymine and Adenine always pair together while cytosine and guanine go together.
The mitochondria breaks down food into molecules the cell can use.
Microscopes
Before the development of microscopes, the existence of cellular life was unknown. By examining a piece of cork, Robert Hooke first saw and named cells. Antony van Leeuwenhoek was the first person to see living cells.
No, but you can always turn to google, or ask a relative as they may be more experienced.
