During the process of ossification, an existing tissue is replaced by bone.
Hemoglobin has tetrahedral structure containing four heme groups that surround a globin group.
Heme is ringlike organic compound also known as a porphyrin to which an iron atom is attached. There are four iron atoms that bind four oxygen atoms and transport them to tissues.
Cell membrane so you can think outside the box
The mesosphere is the coldest layer of the atmosphere.
Hope that helped you.
The tiny solid particles which play in the cloud formation are solvents.
