Sensor -> control -> effector
Answer:
The cell membrane is what lets things in and out of a cell.
Explanation:
The answer is A. Greenhouse Gases.
Greenhouse gases are a result of using non renewable energy sources like burning crude oil. Greenhouse gases are bad for our planet, as these gases trap the heat in our atmosphere - thus making our planet hotter than usual. Example of greenhouse gases are methane, ozone and nitrous oxide.
