Structure A reacts faster with nucleophiles than structure B.Explain. 
Definitions:
Defensive Cells
Cells within the immune system that are involved in protecting the body against both infectious disease and foreign invaders.
Reproductive Cells
Cells specialized for sexual reproduction, capable of undergoing meiosis to produce gametes or fertilized to form a new organism.
Excretory Organs
Organs involved in the process of removing waste products and excess substances from an organism's body, such as kidneys in humans.
Choanoflagellate
A group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals.
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