Does global temperature effect the number and severity of tornadoes? what would be the control group or constant for this experiment?

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

28. how many linkage groups will be formed by homogametic organism with 28 chromosomes?

What are the four stages of cell signaling?