Tamika's cat learned to press a lever so more food would be poured into her food bowl. Tamika's roommate's kitten watched the older cat perform this behavior and within a month the kitten was performing this behavior. This is an example of:

hi,

the answer is third world countries, take for instance china, they restricted each family with only one child,

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option number one would be youre best option

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds