A phospholipid is a lipid made of a phosphate group with two fatty acids.
A second messenger is a molecule inside cells that acts to transmit signals from a receptor to a target. 
Hoped this helped.
~Bob Ross®
        
             
        
        
        
Answer:
Soil can become waterlogged. The water can cut off the air supply to the roots and to the organisms that live in the soil. If the roots do not receive enough oxygen, the plants will die because they rely on oxygen to complete photosynthesis. 
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Answer:
go to https://quizlet.com/85711891/notes-flash-cards/
to get your answer it has the one you are looking for i didnt want to copy it tho
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Answer:
A purine always forms a complementary base pair with a pyrimidine. 
Explanation:
Purine bases such as Adenine pair specifically with Thymine , a pyrimidine base forming two bonds; just as Guanine pair specifically with Cytosine forming three bonds.
This specific base pairing are complimentary in nature and grants stability to the DNA.