Thylacosmilus is a marsupial, and Smilodon is a mammal. Thylacosmilus and Smilodon both have saber teeth, but they do not share an ancestor that had saber teeth. What are saber teeth for these organisms?
A. analogous structures
B .homologous structures
C. vestigial structures
D. mutated structures

Analogous structures

Explanation:

Analogous structures are characters that derived separately in two different species to achieve the same function. If the Thylacosmilus and Smilodon don't share an ancestor then saber teeth must be analogous

this protocol describes a detailed procedure for intracellular flow cytometry staining.

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)]