Ques:Q: A problem with using food chains to describe ecosystems is that some organisms can feed on or be consumed by species from more than one of what level? Choices: - biome level - habitat level - pH level - trophic level A:

Ans:trophic level
-----
Ques:Q: The stomach mucosa's epithelial lining consists only of surface mucus cells, which secrete a protective coat of what? Choices: - bile mucus - phosphate mucus - acidic mucus - alkaline mucus A:

Ans:alkaline mucus
-----
Ques:Q: Trophic level 4 = tertiary consumers that eat what kind of consumers? Choices: - insects - herbivores - primary consumers - secondary consumers A:

Ans:secondary consumers
-----
Ques:Q: Regulated by guard cells, stomata allow what to enter and exit the plant? Choices: - molecules - fluid - nutrients - gases A:

Ans:
gases
-----