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the parts that you control
It would be an insulator- chalk board erasers normally consist of two parts, a wooden handle and a soft pad that wipes off the chalk from the board. Neither of these parts are conductors of electricity.
No,, the consist of only two elements, or two types of atom. But depending can consist of more than two atoms depending on the valences of the elements involved. Examples (covalent): H2O, H2O2, CO2, SF6, Cl2O7, Examples (ionic): Na2O, Na2O2, CaF2, Fe2O3
the two groups are compared
Two reasons: your food could contaminate your experiment, and the experiment could contaminate your food.
a control and a variable
It is true that solutions consist of two parts namely solvent and solute. When the two are mixed in a balanced way, they will form a homogeneous solution.
the dispenser and the payload
The dispenser and the payload.
atria (atrium is singular) and ventricles
Yes
The two main parts of an ecosystem consist of the abiotic and the biotic factors. These all interact with one another.
Every virus consist of a capsid and genetic material.
environmental
There were two parts... one was Cyanocobalamin, but I don't know the other.
The dispenser and the payload
yes, he discovered electrons.