A group of organs that work together to perform a common function is an organ system
The theory of evolution proposed that a series of catastrophes or mass extinctions followed by repopulation could explain why species change over time
The stereotype is that all australians are some sort of zookeepers? and wear clothes like that. also that they drink beer a lot.
our thyroid glands plays a main role in a human body. It secretes thyroxine and calcitonin. In which thyroxine help in growth and cellular metabolism and calcitonin helps to regulates calcium concentration in blood . If thyroid gland stops working then there is low level of calcium in our blood, which leads to mental and hormonal disorder. In this way a person's blood calcium level would be affected if his/her thyroid gland stops working.
