Which is easier to identify karyotype changes in number or in chromosomes structure

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 best describes the dropping height of a ball that bounces back up to a height of 45 cm

All eukaryotic cells contain small bodies called