<span>In the reaction that builds a fat, hydroxil groups react with carboxyl groups. Both hydroxil and carboxyl are </span><span>functional </span>groups<span> in biological molecules. The h</span>ydroxil group is group of atoms found in organic compounds, expressed with the formula OH. The carboxyl group are found in acids.
Answer:
C. four single covalent bonds
Explanation:
Carbon atoms can form four single covalent bonds.
The alula is a small structure that is found on birds. It is located at the joint between the hand wing and the arm wings of birds and it is the freely moving, first digit of a bird's wing. It is normally used by birds in slow flight. In humans, the structure that is comparable to the alula is the thumb.
The immune system.
The immune system acts as a defense system of the body. It fights against bacteria, viruses and any other disease causing pathogens. Some chemicals can weaken the immune system and make them vulnerable.
