Mammary glands are classified as:*Simple alveolar glandsSimple branched alveolar glandsCompound tubuloavelolar glandsCompound alveolar glands

Mammary glands are classified as compound alveolar glands. Here's a step-by-step explanation:

1. Simple Alveolar Glands: These are simple glands that have a single duct that does not branch and ends in a secretory unit, which is round or oval, known as an alveolus. Mammary glands are not classified as simple alveolar glands.

2. Simple Branched Alveolar Glands: These glands have a single duct that branches into several other ducts, each ending in an alveolus. Mammary glands are not classified as simple branched alveolar glands.

3. Compound Tubuloalveolar Glands: These glands have a branched duct system and the secretory units have both tubular and alveolar components. Mammary glands are not classified as compound tubuloalveolar glands.

4. Compound Alveolar Glands: These glands have a branched duct system and the secretory units are purely alveolar. Mammary glands are classified as compound alveolar glands. They have a complex system of ducts that branch out and end in alveoli, which are the milk-producing units