The answer is D, all of the above are producers.
The adult frog is a carnivore, it feed on insects such as grasshoppers, spiders. It can eats worms and any other living things which fits into its mouth. The liver is a digestive gland that helps in the process of digestion. It produces bile. The bile is collected in the gallbladder and it is poured in the upper part of the small intestine through the common bile duct. The bile assist in digestion. The other important function of the liver is to store digested food.
Their shapes fit snugly together
They have valves that give it a pumping effect so that it can pump blood
