What metal is Earth's core mostly made of? a.)copper b.)titanium c.)iron d.)gold

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.

Wich organism obtains its energy from dead or decaying matter

In which state was more than 100 billion tons of coal mined in 2005?