Answer:
a. iris
Explanation:
iris is actually the structure of the eye that regulates the amount of light passing to the visual receptors of the eye
Answer: Ectotherms depend on external heat sources. Their body temperature changes with the temperature of the environment. Endotherms generated heat internally to maintain body temperature.
Explanation:
Answer:
<em>Water would be considered a </em><u><em>actual renewable resource</em></u><em>.</em>
C. Actual renewable resource
Sink<span> is a </span>carbon<span> reservoir that is increasing in size, and is the opposite of a </span>carbon<span> "source". The main natural </span>sinks<span> are the oceans and plants and other organisms that use photosynthesis to remove </span>carbon<span> from the atmosphere by incorporating it into biomass.</span>
The lower respiratory tract is sometimes referred to as the tracheobronchial tree, this describes the branching structure of airways supplying air to the lungs, this includes the trachea, bronchi and bronchioles.
