excretory system: removes waste from blood.
respiratory system: obtains oxygen so the energy in the nutrients can be extracted.
circulatory system: transports nutrients from small intestine to the othet tissues.
nervous system: regulates and controls digestive functioning.
( Am not completly sure, but i think this is the answer)
Facilitated transport ! this is passive transport but with specific proteins !
The scientist you're looking for is an anthropologist.
By low temperature, it can melt. High pressure will raise the melting point of the rock.
It would be d because you could get it again but it would be a different kind
