What was the difference between the estimated versus actual forced vital capacity? when might it be useful to use the estimated numbers instead of measurements?

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

The first generation of offspring from the cross of two parents is called the a.f1 generation b.f2 generation c.short generation d.p generation

Are the layers of rock above and below the coal older or younger?