First down means you have four tries to get another first down or score points. Second down means you only have three tries to get another first down or score points before it's automatically turnover on downs.
Additionally a first down is accomplished by progressing 10 yards.
Difference between first shifting and second shifting theorem
what is the difference between first and second class proteins
difference is the
they both have fun!
second onetransmits,first onereceives.
The first one Claire isn't their friend in the second she is
A second alto has a wider range in the lower register than a first alto has.
Yes. The first is a speed (or velocity), the second is a distance.