Author: Study Clue

In most mammals, which chromosome pair typically determines male sex development A ZZ sex chromosomes B XO sex type C

In mammals, which skin protein mainly strengthens hair, nails, and outer skin layer A Chitin B Cellulose C Keratin D

Which mammalian vertebrae group usually forms the neck region and allows head movement A Thoracic vertebrae B Lumbar vertebrae C

In mammals, which skin layer structure mainly produces hair and supports its growth A Sweat pore B Hair follicle C

Which feature is most directly used to feed newborns in mammals A Mammary glands B Poison glands C Ink glands

In birds, the tendon that passes through the triosseal canal to lift the wing during upstroke belongs to the A

In birds, the spongy, highly vascular tissue that forms most of the egg yolk support is the A Chalaza B

In birds, the strong bone that forms a major part of the shoulder and supports wing movement is the A

In most birds, the lower jaw is directly hinged to which skull bone, increasing beak mobility? A Frontal bone B

Which feature is unique to birds among living vertebrates and is essential for flight and insulation? A Hair B Scales