<span>A gradual increase in atmospheric carbon dioxide would warm earths atmosphere becuse carbon dioxide is <em>a greenhouse gas</em></span>
Active transport requires energy when moving molecules against a concentration agent. It requires for specific membrane transport proteins. Only a certain type of protein can move a certain type of substance.
The three main types of Active Transport are:
1) Sodium-Potassium Pump
2) Endocytosis
<span>3) Exocytosis </span>
Answer: A
Explanation:
Caravan is just a parade in a different font
