Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting.

the one that best describe red blood cells is : C. they transport oxygen throughout the body NOT A, because like its name, it has the color of red, not colorless NOT B, the one that protect our body against disease-carrying microorganism is white blood cells Not C, because the one that aid in blood clotting is the Vitamin K that contained in white blood cells

Fossil found in strata reveal that unused body part decrease in size