The answer is A and here is everything written out, hope it helps! :)
Answer:
what deos this mean idont u nderstand
Blood circulation is the answer
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The defining characteristic of the intertidal zone is that it is submerged with water during high tide and exposed to the air during low tide. The zone can take many forms, from sandy beaches to rocky cliffs. It is common for the intertidal zone to change frequently, since it is constantly battered by crashing waves.
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Eubacteria are considered to be “true bacteria”. They are characterized to a lack of nuclear membrane, single circular chromosome and have cell walls composed of peptidogycan. A popular classification system divides all living beings into three domains: Eubacteria, Archaea, and Eukaryotes Hope this helps!