Answer:
1. true
2. human immunodeficiency virus) is a virus that attacks the immune ... HIV is often spread by people who don't know they have it.
Some answers can be:
When there is no selective pressure
When there is low gene flow
When there is a bottleneck
Answer:
adaptations (based on natural selection)
Answer:
u should know this, it is an opinion
Topsoil is the most fertile soil layer for plants.
