This would mean a lot if yall helped me:)

they are reflecting twins if there heads are combined but if there not there not reflecting twins.

Explanation:

I read it in a book, biography, autobiography, and the lesson says it.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.