What is the name of this hydrocarbon C-C-C-C-C-C-C-C-C-C
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C

please help

You count the carbons. The way it is written is confusing but If there are ten carbons then its decane. If it’s 11 then its undecane
9 would be nonane

Hind limbs will typically be stronger than forelimbs. For some animals this is because they are used for self-defense (a horse or donkey kicking, for example). Forelimbs are not going to be as strong and are often used for feeding oneself, and not intended to be as weight bearing in many mammals.