Answer: the nucleus
Because it contains protons and neutrons whose mass is too much when compared to electrons.
Hope this helps ʕ•ᴥ•ʔ
D. The initial breakdown of glucose to pyruvic acid. It's the first step of cellular respiration, and also happens to be an anaerobic stage. Hope this helps! :)
eukaryotic I believe because they are the cells that have a nucleus enclosed within membranes.
Answer:
Explanation:
Organisms have different forms of circulatory systems. Humans have a closed circulatory system, while many mollusks and other invertebrates have an open system. In a closed circulatory system, blood is enclosed within blood vessels.