Explanation:
the amount of CO2 found in the atmospheres varies over the course of a year how much of this variation happens because of the role of plants in the carbon cycle respiration occurs all the time but dominates during the colder months of the year resulting in higher CO2 levels in the atmosphere during those months.
*hope this helps*
The answer is totally D. Chemical messenger !
none of the others really make sense haha
Thank you so much for the points I hope you have a wonderful day
The answer would be c. This is because hormones are apart of the endocrine system and dispose of extra salt in the body. Helping with urinating is part of the excretory system.
Hope this helps :)
