The correct answers are A and B
the third Choice is the answer i think.
Answer:
When the calcium level is high in the bloodstream, the thyroid gland releases calcitonin. Calcitonin slows down the activity of the osteoclasts found in bone. This decreases blood calcium levels. When calcium levels decrease, this stimulates the parathyroid gland to release parathyroid hormone.
11 minutes per cigarette, assuming it's a 20 pack around 220 minutes or 3 hours 40 minutes
D- Around 12 breaths per minute
Xylem and phloem
hope u got it right
