Scientists use labs to Design and Carry out experiments.
Answer:
Haemoglobin (Hb) is a protein present in red blood cells that transports oxygen and gives blood its dark/vivid red color. The amount of haemoglobin in the blood varies from person to person. Men's levels are often greater than women's. This is scientifically proven however, it is often but not all the time.
I believe the answer is B
The reticular connective. I'm not going to lie, I learned that from NBC Hannibal and I fact checked it and it is correct! XD