When pipetting what angle should you hold the micropipette

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

Calculate the number of molecules present in 0.750 mol of mgo.

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball