Nitrifying bacteria gets nitrogen from the air and turns it into nitrogen that is available for plant use. This can be seen in the nitrogen cycle which may be useful to you
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The eggs of the fluke are passed into water supplies from feces and urine of infected people. After hatching the parasite actively swims and invades the body of a snail, usually by penetrating through the snail's foot. The parasite requires the presence of certain species of snails (e.g., Oncomelania, Biomphalaria, Bulinus) to transform (and multiply) itself into an infective stage, called cercaria.
<span>Complementary base-pair rule.</span>