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:
trophic level

(Question)
Q: Catalytic converters used on motor vehicles break down pollutants in what, yielding non-toxic compounds? Choices: - muffler - intake - oil - exhaust A:
(Answer)
exhaust

Ques: Q: What are the two most common common ways that brain and spinal cord injuries occur? Choices: - falls and surgical error - sports and household accidents - car crashes and falls - car crashes and athletic activities A:
Ans: car crashes and athletic activities

(Q).
Q: Stomata are special pores that allow gasses to enter and exit what? Choices: - the skin - the flower - the soil - the leaf A:
(A).
the leaf

Ques:Q: Alchemists, as early as the eighth century, knew nitric acid as aqua fortis, which means? Choices: - isolated water - clean water - applied water - strong water A:

Ans:strong water

Ques:Q: Twin studies have been instrumental in demonstrating what type of component in autism? Choices: - internal - bacterial - natural - environmental A:

Ans:
environmental