You get less energy from hydrogen gas than you put into producing it.
Answer the following statement true (T) or false (F)
True
Hydrogen gas as an energy source has a negative net energy yield.
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Which of the following best represents the actual percentage of the world's population that gets their drinking water from aquifers?
A. 50% B. 25% C. 75% D. 100%
Consider the scenario in which peas are planted in Ontario on May 1. If the peas need 1200 growing degree-days before they can be picked, and if the mean temperature for each day from May to July is 21°C, in about how many days will the peas be ready to pick? (Assume a base temperature of 4°C).
A. 70 B. 30 C. 120 D. 40
This figure indicates that increasing GNI per capita is associated with
A) first decreasing but then increasing population growth. B) first increasing but then decreasing emissions of carbon dioxide (CO2). C) first decreasing but then increasing emissions of carbon dioxide (CO2). D) increasing emissions of carbon dioxide (CO2). E) decreasing population growth.
As you saw in "DO or Die", adding nutrients to a lake has direct effects (such as stimulating the growth of phytoplankton) and indirect effects throughout the community (such as drastic effects on fish populations). Suppose you triple (3x) the phosphorus input in a lake where phosphorus is limiting, and phytoplankton populations grow dramatically. Based on your observations, which of the following predictions is most likely to follow the phytoplankton bloom?
What will be an ideal response?