The branch of zoology under which the external shape and external structure of animals are studied is called Morphology. Morphology focuses on examining the form and structure of organisms, including their external features and physical characteristics.
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The branch of zoology that studies ductless glands is called Endocrinology. Endocrinology focuses on the study of hormones, their functions, and the endocrine system, including ductless glands such as the thyroid, adrenal, and pituitary glands.