Two waste products that are released when you exhale are and

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

Identify the area on the image where the force of attraction is the strongest.

Analyze how the four requirements for life were identified by scientists