write T if the statement is true and F if the statement is false
1.the muscle in the heart is voluntary muscle.
2. the oxygen is a waste material of the body.
3. the kidneys remove urea from blood through tiny filtering units called nephrons.
4. the liquid wastes from the blood is remove in our body in the form of urine.
5. the bain weighs about 1.5 kg and contains billions of neurons
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