Which material is primarily a mixture of weathered rock and organic matter

Select all the true statements about the cosmic microwave background radiation

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

Johannesburg kepler, an apprentice of brahe, believed in the heliocentric universe but rejected past astronomers belief in