A compound is always a substance because it's made out of two or more atoms bonded together. Now a substance isn't always a compound because it takes two or more elements to create a compound in a chemical reaction, ans substances can contain only one element. In other words a substance can be constructed of one type of atom. Some substances that aren't compounds are: gold and baking soda.
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If there is a temperature difference between two objects, the object that has a higher temperature will want to level out its heat. Therefore, it will transfer the heat it needs to the other object if it allows until they are the same temperature.
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Answer: Effector cytotoxic T cells
Explanation:
Cells infected with a virus or another internal cellular infection are immediately killed by effector cytotoxic T cells.
Answer: Landscape
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Produce food for the plant
