What organisms in the cladogram have amniotic eggs?

The process by which natural forces move weathered rock and soil brim one place to another is called

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

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