The cell membrane has semi permeability meaning that it allows certain molecules to enter the cancel and disable other molecules from entering the cell.
Answer:
Iodine is a mineral which is present in the food such as diary products, sea foods, fruits, vegetables, and iodized salts. Body needs iodine to synthesize thyroid hormones, and these hormones helping in the control body metabolism, and other functions. Thyroid hormone is also playing an important role in brain, and bone development during infancy.
Thyroid gland have ability to transport iodide (concentrate) from blood which is required for produced thyroid hormones. In this process sodium-iodide symporter is playing the key role to transport iodine molecules into the cell.
In the deep waters of the ocean, coral reefs are found in abundance. Algae live on these coral reefs, providing nutrition and producing pigments that give color to the corals. The corals offer shelter to the algae. So, they share a symbiotic association. Climate change has led to increased temperatures and has caused the corals to throw away the algae living inside them. This action causes the corals to be bleached because of a lack of pigment. This change will lead to coral bleaching. The corals will die of lack of nutrition with time.