Question: Q: The ambrosia beetle bores holes in? Choices: - flowers - dirt - leaves - tree bark A:
Answer: tree bark

Question: Q: Red bone marrow, tonsils, spleen, and thymus gland are considered organs of what system? Choices: - endocrine - nervous - circulatory - lymphatic A:
Answer: lymphatic

Question: Q: What type of species have a large effect on the balance of organisms in an ecosystem? Choices: - decomposers - producers - secondary consumers - keystone A:
Answer:
keystone