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According to the cladogram, which organisms have roundworms as a common ancestor?

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

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