The answer A. DNA in the nucleus controls all cell activity.
The major causes of the greenhouse effect is excessive carbon dioxide gas in the atmosphere. The greenhouse effect is a process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by green house gases, such as carbon dioxide, water vapor, metahne, nitrous oxide, and ozone. The absorbed energy warms the atmosphere and the surface of the Earth.
All organisms are composed of one or more cells
Cells are the basic unit of structure and function in a living organism
Cells come only from the reproduction of existing cells
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Explanation:
