Describe the interaction between the digestive and circulatory system of the earthworm.Why is it that hormones act only on their target organs? Name hormones that have
most body organs as their target organs. Hypothyroidism and hyperthyroidism may
lead to marked increase/ decrease, respectively, in body weight. Why is that so?
Discuss the similarities and differences between thyroid hormone and steroid
hormones. Illustrate the secretion of insulin hormone

Discuss the seasonal cycles of phytoplankton and zooplankton biomass in polar, temperate, and tropical regions of the ocean.

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