Answer:
In the natural carbon cycle, there are two main processes which occur: photosynthesis and metabolism. During photosynthesis, plants use carbon dioxide and produce oxygen.
Explanation:
Planarian<span>, </span><span>any of a group of widely distributed, mostly free-living flatworms of the class Turbellaria
These are elongated and ciliated
Mouth is middle of the body
hope it helps</span>
True...................................
I'd say that it is incorrect because each carbon atom should bond 4 times and all three carbon atoms in this structural formula only bond once. The reverse is true for hydrogen atoms. They only form one bond but in this structural formula two of them have four bonds. I don't know about nitrogen though.
The reaction between allergens and IgE antibodies causes the release of chemical substances such as
histamine, leukotrienes and prostaglandins
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