Can someone answer a + c for me please

Which experiment would most likely contain experimental bias

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

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