Andre is studying snails and how fast they travel. he observes three groups of snails containing four snails each. here are the recorded observations from andre’s notebook: group a snails averaged a speed of 4.7cm/min in a petri dish. group b snails averaged a speed of 2.8 cm/min on sandpaper. group c snails averaged a speed of 3.3 cm/min in the dirt. based on this data, what is affecting the snails’ speed?