Name two animals which give us milk. Which animal has hump on its back? Which animal gives us wool?

Step 1: Name two animals which give us milk.
Donkey and camel (the animal labeled as horse in the image).

Final answer: $\boxed{Donkey and camel}$

Step 2: Which animal gives us wool?
Sheep gives us wool.

Final answer: $\boxed{Sheep}$

Step 3: Which animal has hump on its back?
Camel (the animal labeled as horse in the image) has hump on its back.

Final answer: $\boxed{Camel}$

Step 4: Memorise the sentence.
Domestic animals are very helpful for us.

Final answer: $\boxed{Domestic animals are very helpful for us.}$