Answer:
Y most likely represents springs.
Answer:
But sometimes it can linger for weeks or months after you've been sick with a viral infection, such as the flu. This is known as post-viral fatigue. You may not know that you have it because your are asymptomatic.
Explanation:
Answer:
The fusion event is when the virus membrane and the host cell membrane fuse together allowing a virus to enter. It does this by attachment or adsorption onto a susceptible cell; a cell which holds a receptor that the virus can bind to.
Explanation:
