Classify the organisms based on the presence or absence of a notochord in their embryonic stage. butterfly squid salmon lizard dandelion only if you are 100% sure

Organisms with notochord: Salmon , Lizard

Organisms without notochord: Butterfly , Squid and dandelion.

Explanation:Notochord is the small cartilage made structure present in embroye which is going to be the part of vertebral column in baby.The animals containing the notochord are known to belong to phylum chordate.Fishes and amphibians are chordates, so salmon and lizard are organisms with notochord.While other three are arthropods, mollusk and anthophyta.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.