It is B and I know it because I am in college and I already know about this question so your welcome for helping put
Lamprey and hagfish are jawless fish, with skeletons composed of cartilage. They do not have scales and are considered primitive fish. They are in the superclass cyclosystoma.
The answer is: you can treat bacterial infections, not viruses with antibiotics.
The use of antibiotics in viral infections is not effective and many organizations recommend the use of antibiotics only when there is a documented bacterial infection. The treatment of viral infections has been difficult for they are tiny and replicate inside the cell.
In comparison they both show feeding relationship in an ecosystem.
In contrast, a food chain is a simple linear feeding relationship while a food web is a complex feeding relationship.
2) The arrows is to show the direction of the feeding relationship
