Which question is testable? a. how does changing the amount of water affect the growth of corn? b. is it ethical to use human tissue removed during surgery for scientific research? c. are you happy with your new job? d. will people be disappointed if car insurance rates increase?

What links the two strands in a dna helix together in the middle? a. phosphate groups b. sugar rings bonded together c. proteins d. bases with hydrogen bonds

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

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