What period of pregnancy begins with conception and ends with delivery? user: what is gestation

Maintaining a healthy weight allows the respiratory system to work more effectively because a. oxygen is being delivered more adequately. b. the heart does not have to pump as forcefully. c. the capillaries are constricted. d. the lung capacity allows for small amounts of air.

Which sti is a common cause of cancer?

What is the role of osteocytes, osteoblasts, and osteoclasts in bone repair?