For many of their illnesses scientist and doctors haven't treated them before so they don't know how to treat them or exactly if the animal can handle the treatment
Different enzymes have specific active sites which can only catalyze one <span>substrate. Enzyme-substrate complexes are produced only when the substrate fits into the active site :)</span>
Answer:
capillary, arteries, veins
Explanation:
capillary are tiny blood vessels connecting arteries to veins
The answer is c mediastinum
