The most appropriate answer is D ! as other three are not related to cilia any way !
so D
if you want more info on this, comment !
The most common and the most delicious substance are chocolates. Chocolates have plenty of chemical substance that could calm your brain and affects your body. It has Phenylethylamine substance that is actually produced by our brain when we are interested in something or when we are in love with someone. Chocolates are healthy.
Ethos means attribute of spirit of a era, culture, or community. Some synonyms include: <span><span>spirit, character, atmosphere, climate, mood, feeling, tenor, or essence. Hope this helped you!</span></span>