The the choices provided the correct answer is noun clause. "Whoever is interested in the past" is a noun clause.
Answer: c. small bodies and long limbs in warm-blooded organisms, light colored fur or feathers to reflect sunlight, lack of sweat glands in many organisms, hibernation during hot months
Explanation:
Any adaptation of organisms in the Sahara desert will be ones that enable the organism to survive the heat as best as possible. Any adaptation that traps or absorbs heat will most likely not be seen here.
Organisms are likely to have small bodies to reduce the area that can be affected by the sun as well as fur and feathers that reflect sunlight to reduce the impact of the extreme Sahara sun on their bodies.
A lack of sweat glands are common with desert animals to avoid extreme water loss and it will be common to see organisms hibernating in periods that are especially hot so as not to be adversely affected by the heat.