Answer:
The X and Y sex chromosomes
Explanation:
1. Cell
2. Tissue
3. Organ
4. Organ system
5. Organism
1) Cell
2) Tissue
3) Cells
4) Organ
5) Tissues
6) Heart
7) Organs
8) Circulatory
9) Organism
10) Human
2 then 1 then 3 you're welcome
A mistaken change in DNA sequencing or coding that could be harmful, not noticed or beneficial
Hope this helps!
