Answer:
D
Explanation:
The white blood cells in you are the guards of the body. They help fight infections that they dont recongize. They also can break down bacteria.
Answer:
C. Arteries carry oxygenated blood, while veins carry blood low in oxygen
Explanation:
Circadian rhythms are biological changes that occur on a 24 hour cycle. The correct option among all the options that are given in the question is the last option or the fourth option. This is the type of system that happens in plants, animals, cyanobacteria and fungi. I hope the answer comes to your help.
