Explain the answer to the given question at length.
 
Identify the following microorganisms:
Answer variants:
chloroplast
Minerals
Algae
Amoeba
Bread mould
Atmosphere
Nucleus
ADP
a. I am a single-celled organism with an irregular shape and move using finger-like projections. 
 
b. I am a fungus that grows on moist bread and reproduces using spores present in a sporangium.
 
c. I am a green microorganism that produces oxygen and forms the base of aquatic food chains.