Who is the commander in chief of the armed forces? a. army chief of staff b. president of the united states c. president pro tem d. secretary of defense

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.

permafrost layer, it exists beneath a layer of soil, rock or sediment.