①. Why are we called humans when we are obviously animals? Cucumbers are also known as zucchini! Depending on which name you call it, it will be fine!

②, because when the cucumber is really ripe, it is yellow, we usually eat cucumbers are not really ripe!

③, you see the cucumber is green, it is because the yellow is not mature, yellow is yellow after maturity, yellow after maturity, the skin is thicker, a little old, so they are not yet ripe when picked to eat.