Answer:
In a comparison of birds and mammals, the condition of having four limbs is a shared ancestral character
Answer:
No. Viruses are not living organisms.
Explanation:
Viruses are not living things. Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply. Therefore, viruses are not living things.
Es | HIV.gov
There is currently no vaccine available that will prevent HIV infection or treat those who have it. However, scientists are working to develop one.
Your skin gets damaged to prolong exposure to U.V. Resulting in darkening of the skin