____________________ are cells that form and contain black pigment.?
Fill in the blank(s) with correct word
Melanocytes
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The vitamin that is a coenzyme in amino acid and nucleic acid metabolism is
A) vitamin B5 (pantothenic acid). B) vitamin B6 (pyridoxine). C) vitamin B9 (folic acid). D) vitamin C (ascorbic acid). E) vitamin K.
Among the extant vertebrates, only the bony fishes (Osteichthyes) possess bone
(a) Why, then, do we make the assumption that the ancestors of cartilaginous fishes must have had bone that was subsequently lost? (b) Why don't we think this is true for the lampreys and hagfishes?
The breasts are attached to the chest superficial to the ________ muscle
A) serratus anterior B) trapezius C) subclavius D) pectoralis major E) rectus abdominis
Both males and females have accessory reproductive organs, including ducts through which gametes are carried.
Answer the following statement true (T) or false (F)