Answer:
cyclin-dependent kinase (Cdk)
Explanation:
D. Nuclei because according to my recent research on this problem.
Yeah where’s the picture?
The genetic defect most likely causes each leaf to lack a sufficient root system that can support the plant's growth
Fusion is the joining of two or more things.
Fission is the splitting apart.
So really you read the question and look for the clues and you determine which one it could be.