Answer:
a. Centromere
A centromere is a specialised DNA sequence of a chromosome that links pair of sister chromarids (a dyad)
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
Both of them produce mucus.
The answer is B. Chromosomes which you get from your parents
Answer:
the right awnser is 3 b and 1 w vote brainliest this is right.
Explanation:
