Is mass conserved when 200 g of water undergoes a physical change? use complete sentences to support your answer by explaining how this can be demonstrated.

plsss

Compare asexual reproduction to sexual reproduction

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

2. which is the last step in the scientific method?