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1. Minerals in the plants are not lost when the leaf falls.
a. Minerals are remobilised from older drying leaves to younger leaves.
b. Calcium can also be remobilized.
2. The walls of the right ventricle are thicker than the right auricles.
a. The form the lower part of the heart.
b. The left and the right ventricles are separated by an interventricular septum .
c. The walls of the right ventricle are thicker than the right auricle because, the right ventricle has to pump the blood with force away from the heart .
3. Mature RBC in mammals do not have cell organelles.
a. Mammalian RBCs lack a nucleus, and the cells are biconcave in shape .
b. The absence of mitochondria allows the RBCs to transport all the oxygen to tissues .
c. The loss of the endoplasmic reticulum allows more flexibility for RBC to move through the narrow capillaries .
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