We are eukaryote which means are cells are more advanced than there's. And since we have more cells than a amoeba. Our cells carry oxygen to the brain and other organs in the body. A amoeba dose not have a brain. So it doesn't need a circulatory system.
snail
because their body have a direct contact with the environment
Most mollusks have an open circulatory system, except class cephalopoda
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Larger organisms develop cells that each do very specific chores. They depend on other cells to deliver the required oxygen and nutrients. The circulatory system allows the cells that are in charge of providing these required substances to the other cells.
Transportation
whats a name of a royal chair?
Circulatory and Cardiovascular system
To transport materials throughout the body.
All bird species have different circulatory systems, for the most part the smaller species have an open system, while larger birds have a closed system.
Im searching for the flipping answer! I dont want to answer it ¬_¬
No it gets what it needs from it's environment