He should raise his hand and wait for a teacher
Answer:
Your heart is a single organ, but it acts as a double pump. The first pump carries oxygen-poor blood to your lungs, where it unloads carbon dioxide and picks up oxygen. ... The second pump delivers oxygen-rich blood to every part of your body. Blood needing more oxygen is sent back to the heart to begin the cycle again.
Explanation:
B. the nervous system connects bones
D. Bacteria because “bacteria” is actually a domain itself
Answer:
Hyperthermophiles (above 80°C).
Acidophiles (usually at pH 2.0)
Alkaliphiles (extremely high pH value 9 to 13)
Extreme halophile
Explanation: