The answer is Chordates
Chordates belong to the pylum Chordata of the Animal Kingdom.They have the following characteristics;
Lower vertebrates have a notochord which is a hollow nerve chord that is located dorsally of the animal while higher vertebrates have a vertebral column of bone and cartilage. They have a coelom which is a body cavity that differentiates higher vertebrates into organs and digestive tract.
Answer; (not correctly matched)
Apocrine gland; Thermoregulation;
Explanation;
Apocrine glands are found in the skin and the eyelids.
Most apocrine glands in the skin are in the armpits, the groin, and the area around the nipples of the breast.
They are scent glands, and their secretions usually have a odor. They empty into the hair follicle just before they open onto the skin surface.
Topoisomerase is the enzyme that can be added to correct the untwisting that is led to strain ahead of the replication fork.
Electron pairs , because the atoms become stable by gaining the electron pairs
