Answer:
Explanation:
Explanation:hola me respuesta es d
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The highest power objective because you will see the specimen perfectly
Answer:
These are needed to mimic the blood vessels which these organs will use for the supply or drainage of fluids e.g blood.
In addition the empty tunnels serve as the routes for nutrients and oxygen supply for the organ.
In summary the tunnels provided a vascular structure to support the organ
Explanation:
Because people throws trash into rivers and stuff and they flow down into the ocean and makes it unclean
