Problem: OPTIONS:
- muscular and lymph systems
- circulatory and digestive systems
- respiratory and lymph systems
- respiratory and circulatory systems
Q: Q: Which systems work together to provide cells with the oxygen they need for cellular respiration? A:
Answer: respiratory and circulatory systems

Problem:OPTIONS:
- snail
- trees
- shark
- fish

Q: What were the first vertebrates to evolve? A:
****
A: fish

Q: An organism that carries pathogens from one individual to another is called what? A:
OPTIONS:
- germ cell
- virus
- host
- vector
vector

Q: Varves form in lakes covered by what? A:
OPTIONS:
- coral reef
- bridges
- soot
- ice

Answer: ice

Question: Q: The process of producing mature sperm is called what? A:
OPTIONS:
- spermatosis
- glycogenolysis
- ketoacidosis
- spermatogenesis
Answer: spermatogenesis

input: OPTIONS:
- carbon monoxide
- hydrogen
- oxygen
- carbon dioxide Now, answer this question: Q: What gas is expired out of the body during exhalation? A:
A:
output:
carbon dioxide