The mass extinctions that occurred 250 million years ago and 65 million years ago may have been due to gradual process or Catastrophic events.
Answer:
All organ system(s) are important for proper functioning of the organism but I think Circulatory System is the most important one...!
Explanation:
Because the organism will die without proper blood circulation...!
Answer:
Explanation:
I think it's b or d may a
Answer:
rarefaction
Explanation:
along the same direction the wave travels