Taking a cross section of a fiber can reveal what?

A. The shape of the fiber
B. The chemicals used in the fiber.
C. The color of the fiber.
D. The pattern of the fiber.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.