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Animals are heterotrophic..
Heart is an organ..
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(a) Animals are considered heterotrophs because they do not prepare their own food and are dependent on plants for their food.
(b) The human heat is merely an organ because it does not solve the complete problem of respiration solely and takes the aid of arteries, veins, capillaries and lungs also.
(c) A stimulus is a change or a variation in the external or internal surroundings of an organism that generates an impulse in their respective receptors.
(d) The process of eliminating waste from the human body is called excretion.
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