Savanna biomes cover most of africa
Answer:
Medulla
Explanation:
The medulla is responsible for our involuntary actions, one of which is our heart rate.
Involuntary action means we do not intentionally do it ourselves; it is one of our unconscious processes, such as breathing.
No change. Change happens only when placed in a culture media.
Hope this helps you
Marine debris takes all of those into a vague answer that intreated sewage solid garbage and toxic chemicals are all created and pushed out to see because of human consumption and usage