Biology

A biopsy is a medical procedure where tissue is taken from the human body to examine it for disease, especially cancer. While animals can also have biopsies, the term is most commonly associated with human medical diagnostics, making 'Human body' the best answer here.

The nervous system primarily consists of the brain, spinal cord, and neurons, which are the fundamental components responsible for processing and transmitting information throughout the body.

A cataract is the clouding of the lens in the eye that obstructs light passage, leading to impaired vision. This matches the description given in the question, making option C correct.

Vitamin B12 is essential for the production of new red blood cells, and the liver stores and utilizes it in this process. Therefore, the liver uses vitamin B12 for creating new red blood cells.

Photoreceptors, which detect light, are located in the retina of the eye. The retina contains rods and cones that convert light into neural signals for vision.

Giraffes do not have vocal cords, which is why they are generally silent and produce very few sounds. In contrast, lions, zebras, and dolphins all have vocal cords and use them to produce various sounds.

The cornea is the only living tissue in the body that does not have a direct blood supply. It receives nutrients and oxygen through tears and aqueous humor, unlike other tissues that rely on blood vessels.

Authoritative sources including the Smithsonian's National Zoo and other wildlife organizations indicate that a Grevy's zebra typically has about 80 stripes in total, which implies roughly 40 stripes on each side. This is significantly more than 36 stripes per side. Therefore, the correct answer is '80+' stripes per side, corresponding to option C. The original answer '36+' is an underestimate and not supported by reliable sources.

The thyroid gland is shaped like a butterfly, with two lobes connected by a narrow isthmus, located in the neck. This distinctive shape differentiates it from the pituitary, adrenal, and pineal glands, which have different forms.

Metabolism encompasses all chemical processes in the body, including absorption, assimilation, and secretion, making it the process that includes all the others listed.