The polar climate zone includes the areas of Earth near the North and South poles. The northern polar zone includes parts of Canada , United Kingdom, and Russia . The southern polar zone includes Antartica .
Answer:
Through their lungs.
Explanation:
They need lungs to take in oxygen and oxygen is vital for survival.
Answer:
Low,high
Explanation:
Thyroxine is a complex organic compound containing iodine. Thyroxine concentration in the body is kept to the required levels through a negative feedback mechanism. The production of thyroid stimulating hormone is regulated by thyroxine. An increase in thyroxine inhibits the pituitary gland which responds by secreting less thyrotropic hormone. This in turn reduces the activity of thyroid gland leading to a drop in thyroxine production. A low thyroxine level removes the inhibitory influence on the pituitary so that more thyroid stimulating hormone is produced.
Answer:
B
Explanation:
Carbon dioxide is a by-product of cellular respiration. To remember this just think "I breath in oxygen to make ATP, and when Im done I exhale carbon dioxide"
Answer:
population density I hope this helps
