At the time of infection with HIV, the higher the number of CD4+ cells that become damaged, the weaker the immune system becomes and the less able a person is to fight off infection and disease. Eventually, this results in the development of AIDS.
When touching things, like a dog, it will send your brain a signal of what the dog feels like and the brain send it back to your hand.
Hope this helps!
-Payshence
Man ask your teacher
It’s helps
All the cells in a person's body have the same DNA and the same genes. However, the difference between cells in different tissues and organs is that the "expression" of the genes differs between cells. Expression means that the message from the DNA is being copied and made into protein.