(a) True. Our tongue is attached to the roof of the mouth cavity at the back and the front is free moving.

(b) False. The large intestine is shorter and wider than the small intestine of the human alimentary canal.

(c) True. The mucus present in our stomach protects the stomach lining from the harmful effects of the hydrochloric acid.

(d) True. All heterotrophs have similar basic nutrition as they take food from outside sources instead of producing their own food.