An enzyme is a catalysts in living things.
A catalysts speeds up the process of breaking down molecules.
An example would be Lactose. It can be broken down by the enzyme Lactase.
The correct answer is "ineffective low performance related to migraine headaches".
According to the patient's description, migraine headaches are creating a serious problem regarding her ability to perform all the actions that her role in her family involves. Her role as a grandmother involves taking care of her grandchildren and keeping up her garden as a hobby. These are actions which she can no longer perform due to her headaches.
The cycle runs like this:
Deoxygenated blood enters from the body to the heart via the superior/inferior vena cava. It goes directly to the right atrium and down to the right ventricle. From there it'll pass through the pulmonary artery into the lungs where diffusion will happen in the capillaries. Gas exchanges will occur and the blood will become oxygenated and return to the heart via the pulmonary vein. From the pulmonary vein it will enter back into the left atrium and then will give the final pump of oxygen rich blood into the aorta and then into the entire body.
I believe the answer is B: Earth's oceans absorb some of the carbon dioxide from the atmosphere.
