1s orbital
Explanation:
The electron has to go into the first energy level, in the 1s orbital. Helium, with two protons, will have two electrons. These are placed one at a time into the 1s orbital. This makes helium a very contented atom.
Answer:
The extinction of a large number of species within a relatively short period of geological time.
The Arteries carries the blood away from the Heart. And the Vein brings the blood back to heart.
Add all of the events to get
Answer:
-Genetic transfer is the process by which genetic material is transferred between two cells.
Explanation:
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