a) The fetal pig was 23 centimetres in length.
b) Scientific Name: Sus Scrofa
Common Name: Domestic Pig
d) The integumentary system is the system that protects the body from damage. It has a variety of functions including providing protection, preventing invasion of foreign materials, preventing dehydration, and regulation of body temperature. In addition to the skin which functions to provide thermoregulation, sensations, protection, production of vitamin D, and healing, other parts are involved in the integumentary system. The hair, nails, nerves, and sweat glands all play a role in the function of the integumentary system - to maintain homeostasis within the body.
a) Sharks have such large livers to help maintain buoyancy. Their livers contain oil which is lighter than water and floats, making the sharks slightly buoyant. Having a liver as apposed to a swim bladder means that sharks’ bodies are incompressible, allowing them to move between deep water and the surface of the water easily. The macromolecule that assists with the role that the large liver must serve is oil which is a type of lipid.