Adrenaline directly affects, regulates and determines the body's ability to maintain a healthy blood pressure. When the adrenal gland becomes damaged or contains tumors, an excess of adrenaline greatly increases blood pressure levels, causing severe headaches, weight loss and other serious problems.

Correct Option: A

Adrenaline directly affects, regulates and determines the body's ability to maintain a healthy blood pressure. When the adrenal gland becomes damaged or contains tumors, an excess of adrenaline greatly increases blood pressure levels, causing severe headaches, weight loss and other serious problems.

The air we breathe in contains about 0.04% carbon dioxide. The air we breathe out contains about 4% carbon dioxide. In other words, exhaled air contains about 100 times the concentration of carbon dioxide that inhaled air does.

Correct Option: B

The air we breathe in contains about 0.04% carbon dioxide. The air we breathe out contains about 4% carbon dioxide. In other words, exhaled air contains about 100 times the concentration of carbon dioxide that inhaled air does.

Chloroquine prevents the development of malaria parasites in the blood. Doctors use it to both prevent and treat malaria. After the malaria parasite Plasmodium falciparum started to develop widespread resistance to chloroquine, new potential uses of this cheap and widely available drug have been investigated.

Correct Option: C

Chloroquine prevents the development of malaria parasites in the blood. Doctors use it to both prevent and treat malaria. After the malaria parasite Plasmodium falciparum started to develop widespread resistance to chloroquine, new potential uses of this cheap and widely available drug have been investigated.

Brain cells do not regenerate. Once lost, they do not come back. Research from Karolinska Institute in Sweden haves shown that the nerve cells of the brain remain the same throughout a person's life.

Correct Option: A

Brain cells do not regenerate. Once lost, they do not come back. Research from Karolinska Institute in Sweden haves shown that the nerve cells of the brain remain the same throughout a person's life.

Alfalfa is a small seeded crop, and has a slowlygrowing seedling, but after several months of establishment, forms a tough 'crown' at the top of the root system. This crown contains many shoot buds that enables alfalfa to re-grow many times after being grazed or harvested. Alfalfa is widely grown throughout the world as forage for cattle.

Correct Option: B

Alfalfa is a small seeded crop, and has a slowlygrowing seedling, but after several months of establishment, forms a tough 'crown' at the top of the root system. This crown contains many shoot buds that enables alfalfa to re-grow many times after being grazed or harvested. Alfalfa is widely grown throughout the world as forage for cattle.