the first answer as blood needs to be oxygenated to be passes round the body then when its deoxgenated it will return to the heart to be pumped around the body again
Answer:
B
Explanation
They have to realease things somehow
The statement Bonds in the hydrogen peroxide are weakened in catalase's active site, allowing the chemical reaction to occur is the answer. Catalase is an enzyme in the liver that breaks down harmful hydrogen peroxide into oxygen and water.
Answer:
used by plants as nutrients i think
Explanation:
Yes, the pterosaurs is the ancestor of the bird.
