1: b
2: c
3: c
i hope this is right
Answer:
Are dependent on
Explanation:
all living things exist in a cycle, all organisms are dependent on each other in keeping it going. Diagrams like food webs help demonstrate this cycle.
Answer:
True
Explanation:
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
