Answer:
C. 200 billion
Explanation:
The milky way galaxy is estimated that there is 200 billion stars
Carbon dioxide is what humans exhale, giving trees carbon dioxide will produce oxygen
Answer:
Chromosome crossing over in prophase 1 where DNA segments are moved between the homologous pair.
Explanation:
Answer:
Our water resources face a host of serious threats, all of which are caused primarily by human activity. They include sedimentation, pollution, climate change, deforestation, landscape changes, and urban growth.
