Xenografts are tissue grafts harvested from a different animal species.
One is pulmonary one is cellular
Option B that is CANDIDA is an example of sac fungus.
Male Birds are usually the colorful birds to attract mates while females are camouflaged to protect their eggs/hatchlings. Ground birds need to be camouflaged because they are easy prey and they have their nests on the ground.
Because the environment is faster then the squrrel has to find stuff for the nest and a safe spot