bio (pls help me)

1. HIV invades the CD4 cells (T helper cells and macrophages). The T helper cells coordinate the acquired immune response; when they are destroyed, the body is no longer capable of producing humoral or cell-mediated immune responses. A person infected with the virus must take antiretroviral drugs. When several such drugs, typically three or four, are taken in combination, the approach is known as Highly Active Antiretroviral Therapy. Antiretroviral drugs prevent the viruses from replicating new particles. In other words, antiretroviral drugs prevent HIV from entering or replicating in cells of the immune system. The classes of antiretroviral drugs include nucleoside and nucleotide reverse transcriptase inhibitors, non-nucleoside reverse transcriptase inhibitors, protease inhibitors, fusion inhibitors, integrase inhibitors, and chemokine co-receptor inhibitors.

2. That that were isolated on the Cralapogas Islands were different from other tortoises found on other islands. This is a form of allopatric speciation, which is when a new species forms while in geographic isolation from its parent species.