The respiratory system brings air into the lungs supplying the blood with oxygen. Oxygen is carried throughout the body to the organs and keeps the heart pumping and when the blood circulates back to the lungs the process starts over again.
Answer:
A
Explanation:
science can answer only mathmatical questions
What was the investigation? But from my best guess I'm assuming it's the second option. This may be incorrect.
C. Euglena are likely are obtain nutrition via photosynthesis.
Widened margins does not occur at the continental margin
