The circulatory system is responsible for the delivery of blood
Phobhos and dhemos are the two moons of mars.
Ostrich eggshell is composed of 96% crystalline calcite and 4% organic material, mostly proteins. The thickness is made up of three different layers that vary in structure and thickness. The hardness of the shell is 3 on the Mohs scale. Pretty solid!
The answer is D, because it is a form of camouflage and an adaptation to the environment for self defense
