Answer:
I am going to say answer D but plz forgive me if i am wrong
Explanation:
Answer: B
Explanation: By most estimates, catalytic converters fitted inside the exhaust pipe of a gasoline-operated car convert over 90% of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) from the engine into less harmful carbon dioxide (CO2), nitrogen and water vapour.
Answer:
4
Explanation:
The circulatory system includes the blood that has picked up the carbon dioxide from all of the respiring tissues and who also delivered oxygen to them to continue respiring.
The blood will then reach the lung where the carbon dioxide that the tissues released is exchanged for oxygen in the alveoli.
* Blood cells isn't an organ system which makes 1 incorrect.
* Digestive system will in no way bring the blood to the lungs or away from it. This is the circulatory system's job. So 2 is incorrect.
*Lastly, lungs are organs and the question asks for organ systems. So 3 is incorrect.
Answer:
Drastic Change
Explanation:
If a Keystone species was removed from its environment, the area would drastically change, due to the fact that the environment is largely dependant on that species, so removing it from the system would change the way the animals interact with the Environment.
Answer:
C) Serotonin
Serotonin, help to stabilize our mood and also helps with sleeping.