Answer:
The nucleus, cell membrane and cytoplasm.
Explanation:
The nucleus, cell membrane and cytoplasm are three elements that cannot be absent in a cell because they are necessary for the survival of the cell. The nucleus controls and regulates the activities happening inside the cell e.g. growth and metabolism etc. Cell membrane acts as a wall to protect the inner part of the cell from the external environment as well as allows nutrients and gases inside and outside the cell. Cytoplasm serves as a medium for the conduction of nutrients and waste from on place to another and also for the medium for organelles in which they floats.
Answer:
Air seal you attic so you keep outside air out and inside air in, get new energy efficient windows, replace old appliances so they take up less energy, keep your water heater warm so that you use less energy by heating up water, switch from incandescent lights to fluorescent lights. Add solar panels.
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Explanation:
The independent variable is the detergent and the dependent variable is the cleanness of the cloths because it depends on how much detergent you use.
Answer:
Any combination of D, E and F
Explanation:
Since A, B, and C belong to different orders, and D, E and F belong to the same order, the latter are more closely related and thus are expected to show a greater degree of structural homology. They are closer to their common ancestor than A, B and C.
