1. Why hydrosphere is important for the living organisms?
2. Why atmosphere is important for the living organisms?
3. Why lithosphere is important for the living organisms?
4. Why biosphere is important for the living organisms?
These are the four questions related to the subsystem of the earth. There are four subsystem of the earth named "lithosphere" which means the land, "hydrosphere" which means water, "biosphere" which means living things and "atmosphere" which means air. 
All these subsystems are important for the survival of living creatures on the planet earth because all living organisms depends on these four subsystem.
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Answer:
Cnidarians represent a more complex level of organization than Porifera. They possess outer and inner tissue layers that sandwich a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.
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Answer:
C
Explanation:
Becuase fom a vaccine you are recieving antibodies by another animal or human donor. 
D is unlinkely since it describes how the mother is nursing the baby, so nothing directly mentioning of the baby recieving any antibodies. The other options also talk about how the body creates its own antibodies, which isn't passive immunity.
 
        
             
        
        
        
Answer:
Spirogyra is a genus of green algae that belong to the order Zygnematales. These free-flowing, filamentous algae are characterized by ribbon-shaped chloroplasts that are arranged in a helical manner inside the cells. So the name is derived from the spiral arrangement of chloroplasts in these algae.
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