D I’m pretty sure that’s defiantly right
B. Four bonds
Carbon usually form covalent bond and can form ionic or other bonds sometimes. Carbon needs four electrons to be stable so the max of bonds a single carbon atom can form is four
The spindle fibers form out of the centrosome, also known as the microtubule-organizing center, or MTOC. Spindle fibers are formed from microtubules with many accessory proteins which help guide the process of genetic division. The spindle fibers form during cellular division near the poles of the dividing cell.
So basically i believe it originates from the centrosome.
Answer:
Explanation:
cardiovascular system is the circulatory system, it permits the circulation of blood and allows for transport of nutrients such as amino acids and electrolytes, oxygen and carbon dioxide gases, hormones, and blood cells in the body. It also helps the body to provide nourishment and fight against diseases and maintain homeostasis.
It is consider an high way because of its function. An high way allows for free passage, with often time no obstruction this is what cardiovascular system does they allow for movement of blood and essential nutrient in the body system for effective function of our body.
In the electron transport chain. Oxygen is the electron recipient because it is a very strong oxidizing agent(very electronegative) and it keeps the chain going.