Answer:
B ) Valves
Explanation:
Valves allow blood to flow only in one direction and prevent the backflow.
Eye strain - hope this helped
Answer:
B. interconnected
Explanation:
All the systems in our bodies (humans are indeed animals) are connected with each other to create a functional being. The blood flows throughout the body, providing nutrients; the bones support the structure and protect the heart and lungs. They work together.
Why not A: The systems are all completely necessary. There's nothing extraneous in our bodies, because extraneous stuff takes up energy, and our biology is incredibly economical.
Why not B: They're not interchangeable. How would you like your bones to turn to blood? Uh-huh.
Why not D: They interact with each other consistently, so they're not separate or segregated.
Many volcanoes breaking through the earths crust. The plate wouldn’t have room to move with the conduction of lava underneath. It would be like bending your knee with a big scab. It would crack and flex up or down. In short, it wouldn’t work out very well
Answer:
Cystosine, Thymine, Guanine,
Explanation:
