Answer:
'gonadotrophin releasing hormone' (GnRH)
Explanation:
Air, water food and every thing that is needed to make a human being alive
The basic structure or a protozoa is a unicellular eukaryote that has a relatively complicated internal strucuture and are meant to carry out complex metabolic activities. Some protozoa also have structures for propulsion or other types of movements. and yes they can be seen under light microscope