D secretes excess water as sweat
Answer:
<h2>
The Nucleus.</h2>
Explanation:
The structure most necessary for a mitochondria to produce new cells is the nucleus.
The nucleus is a very specialized structure that occurs in most cells including the mitochondria.
It is a membrane bound organelle that contains genetic materials which is the DNA of all eukaryotic organisms(multicellular organisms)
It plays important functions such as:
1. Primarily an information center of the cell
2.Metabolism roles
3. Growth and production of new molecules in the mitochondria(mitochondrial bio-genesis).
The answer is Ordovician-Silurian.
The mass extinction thaw was most likely caused by the extinction that was most likely caused by the formation and retreat of glacier was the Ordovician-Silurian extinction. It is the second largest among the five major extinction events.