The Federal Aviation Administration (FAA) shares the Environmental Protection Agency's (EPA) concerns about lead emissions from small aircraft. Owners and operators of more than 200,000 piston-engine aircraft operating in the United States rely on aviation gasoline (avgas) to power their aircraft.
Symmetry (noun). a due proportion of the several parts of a body to each other; adaptation of the form or dimensions of the several parts of a thing to each other; the union and conformity of the members of a work to the whole. Symmetry (noun).
bilateral symmetry is when you can divide something into to equal half's like if you cut a line through the middle of a circle you have 2 half's that are the same that is radi â¦ al symmetry.adial symmetry is every line or direction going towards a central axis in other words all directions pointing to the exact middle of the object. Hope this helps ^_^. P.S. If you don't believe me look it up.