All of the following are physical changes except.. 1. chewing food
2. mixing sugar with water
3. mixing saliva with starch
4. peristalsis

The intervention of extraterrestrials has been used to explain the bermuda triangle, a region of the atlantic ocean where ships and planes are frequently lost, leaving no evidence behind. how would this explanation best be characterized?

Aplant may open end close its stomata to prevent excess water loss and maintain

What is true of sea slugs in these orders