What did Charles Darwin conclude about the finches

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his 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

Aplant may open end close its stomata to prevent excess water loss and maintain

Which is the most dominant generation in a liverwort