Due to their immense oxygen needs, slow-twitch fibers are associated with many blood vessels, mitochondria, and increased concentrations of myoglobin, an oxygen-binding protein in the blood that provides muscles their reddish coloring.
Answer:
B) limestone
Explanation:
Hello There!
This is called the "IRIS"
The iris is the colored part of they eye and it's responsible for focusing light onto the cornea.
