Answer:
A) Iris
Explanation:
The Iris controls the diameter of the opening in your eye, thus also controlling the amount of light let inside. It's also reponsible for the colour of you eye.
Whereas ionic bonds join metals to non-metals, metallic bonding joins a bulk of metal atoms. ... Sodium metal is therefore written as Na, not Na+. ... Both of these factors increase the strength of the bond still further. ... Heat capacity: This is explained by the ability of free electrons to move about the solid.
<span> She developed new models for emergency ultrasound education and competency assessment, created a successful emergency ultrasound fellowship program, and introduced electronic </span>workflow<span> solutions to </span>Hopkins<span>, increasing the use of emergency ultrasound by 7-fold.</span>
Its structure is Au with one dot on top