When scientists measure the ratio between the radioactive parent isotope and the daughter products in a sample to be dated, this is (earth science)

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

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Are humans interfering with or a part of evolution happening today? find examples of evolution seen in recent history that could be caused by human activity.