Explain in detail what the sea lamprey looks like with distinguishing characteristics

answer; /// i believe the correct answer is (thrombocytopenia); (a)

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?