Once massive stars reach the red giant phase, the core temperature continues to increase as carbon atoms are formed from the fusion of helium atoms. Gravity continues to pull together the carbon atoms in the core until the temperature reaches 600,000,000 degrees Celsius. I Hope this helped you!
Answer:
b. muscle fascicle
c. muscle fiber
d. myofibril and. sarcomere
Explanation:
When muscle contracts, the myosin and actin filaments slide antiparallel to one another hence shortening the distance between the adjacent Z-lines of a sarcomere (a functional unit of striated muscle). Technically, nonetheless, the filaments do not shorten. A chain of sarcomeres make up a myofibril. Myofibrils bound together in bundles around a sarcolemma make up a muscle fiber. Several muscle fibers bundled together in an endomysium make up a fascicle. Several fascicles bound together in a perimysium make up a muscle. A muscle has blood vessels and innervated nerves that serve the cells and are bound overall by an epimysium.
The blood vessels and nerves in the muscle do not contract.
Answer:
Destruction of a natural environment is a big threat to the humanity. With the destruction of forests, the wild life is becoming extinct. Lesser number of trees means more harmful gases to be transferred to the ozone layer. Without the ozone layer, the survival of humans on the Earth will be impossible.
If plant or animals become extinct or endangered from a natural environment, this will mean lesser food for the humans. There will be increased competition for food and other resources.
<span>Sicle cell disease is disadvantageous in any continent. However in Central Africa ,where there is a lack of care for health and modernizaition, it will be too hard for a person to heal someone with sickle cell disease. The country is struggling with their sanity having a sickle cell disease will be difficult for them to find a donor who is healthy enough to donate blood.</span>
