That process is known as Respiration in which oxygen get exchanged from the carbon dioxide by alveoli...
4. DNA sequence comparison
5. Random mutations
Answer:
The lowest level, which is usually the producers.
Explanation:
This is because on every level of the trophic system, some energy is lost before the next level. So the level with the least lost energy is the lowest
Answer:
a.
Explanation:
pathogens may enter the body and cause illness.