How is it possible that the f2 generation offspring had some short plants when the f1 generation had no short plants?

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

What part of the brain is highlighted in the diagram below?

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