It tells you what the paragraph is going to be about.
An F1 hybrid (or filial 1 hybrid) is the first filial generation of offspring of distinctly different parental types. F1 hybrids are used in genetics, and in selective breeding, where it may appear as F1 crossbreed. The term is sometimes written with a subscript, as F1 hybrid.
Hopefully not. In basic terms, a series hybrid is a powertrain that uses the electric motor to drive the wheels, and the gas engine to provide the power as an on-board generator. In other words, the gas engine never mechanically turns the drive wheels. Hondaâs new Accord Hybrid is a superb raising of the bar among full hybrids.