11. in a long bone, such as the femur in the leg, the center of the bone contains which substance, responsible for producing blood
cells?
o a. plasma
b. ligaments
c. marrow
o d. synovial fluid

Marrow or C

Explanation:

You got this

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

the answer is c cumulus. cumulus clouds can be seen on a gray and rainy day, because cumulus clouds create thunderstorms. give me brainliest if right.