What is a substance which allows the red blood cells to carry oxygen and iron.

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

List and describe the neurological effects of the vocs and other air pollutants, as described by dr. theo colborn