The process at A is called fertilization.
It is where the gametes of the male and female animal combine.
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~Zoey
James Watson and Francis Crick
The answer is D because only one species benefits from it
Euglena are a unicellular organism. They are classified into the Kingdom Protista. They are then further classified into the Phylum<span> Euglenophyta. All euglena can make their own food by photosynthesis.</span>