Secondary since plants/animals already lived there, but got killed/driven out of the area they lived/thrived in/on.
The group in which a star is classified according to its spectrum, especially using the Harvard classification.
Answer: C
The substance that must come through the cell membrane for the cell to live is nutrients. Cells would die if they did not get nutrients. Nutrients are what keeps the cell running.
True
A opposite is T
G opposite is C
Hope this helps