Q: Net production efficiency allows ecologists to quantify how efficiently organisms of a particular what incorporate the energy they receive into biomass? Choices: - hypothesized level - neural level - sea level - trophic level A:
trophic level

Q: Because of their reactivity, we do not find most representative metals as free elements where? Choices: - in water - in the atomospher - underground - in nature A:
in nature

Q: Q: Graphite is a form of elemental carbon what is another form? Choices: - carbonite - magnite - iron - diamond A:
A: diamond

Question: Q: Since eddy currents and magnetic damping occur only in conductors, recycling centers can use these to separate metals from other materials? Choices: - particles - cranes - alloys - magnets A:
Answer: magnets

*Question*
Q: In the universe as a whole, what is the most common element? Choices: - helium - carbon - oxygen - hydrogen A:
**Answer**
hydrogen

Q: Reducing waste, as well as reusing and recycling resources, can help save what? Choices: - eletrical resources - artificial resources - coral resources - natural resources A:
natural resources