What happened when Dr. John Endler transferred the less colorful, dull male guppies from a region with dangerous predators to a region with less dangerous predators?

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

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