If it killed the top level of an ecosystem it would damage the whole ecosystem because it's connected. An organism depends on that top organism which would mean that is that organism dies it would affect the organism that depends on it.
This is mitosis: the cell does steps before it splits in two
G1 - synthesis - G2 - M(mitosis) in mitosis is PMAT
Prophase
Metaphase
Anaphase
Telophase
Then the last step is cell division or what its called is cytokinesis
It’s the third one bc it’s a declined inheritance