Context: Some organisms, such as the lichen Trapelia involuta or microorganisms such as the bacterium Citrobacter, can absorb concentrations of uranium that are up to 300 times the level of their environment. Citrobacter species absorb uranyl ions when given glycerol phosphate (or other similar organic phosphates). After one day, one gram of bacteria can encrust themselves with nine grams of uranyl phosphate crystals; this creates the possibility that these organisms could be used in bioremediation to decontaminate uranium-polluted water. The proteobacterium Geobacter has also been shown to bioremediate uranium in ground water. The mycorrhizal fungus Glomus intraradices increases uranium content in the roots of its symbiotic plant.

Question: What microorganism can notably absorb a very high concentrate of uranium?
Answer: Citrobacter

Question: What lichen is known to absorb a uranium concentration nearly 300 times higher than the amount in the environment?
Answer: Trapelia involuta

Question: What is given to Citrobacter to cause it to absorb uranyl ions?
Answer: glycerol phosphate

Question: What protobacterium notably bioremediates ground water uranium?
Answer: Geobacter

Question: What fungus is known to cause uranium content in its symbiotic plant roots to increase?
Answer: Glomus intraradices

Question: What macroorganism can notably absorb a very high concentrate of uranium?
Answer: Unanswerable

Question: What lichen is known to absorb a uranium concentration nearly 400 times higher than the amount in the environment?
Answer: Unanswerable

Question: What is taken from Citrobacter to cause it to absorb uranyl ions?
Answer: Unanswerable

Question: What protobacterium never bioremediates ground water uranium?
Answer: Unanswerable

Question: What fungus is known to cause uranium content in its symbiotic plant roots to decrease?
Answer: Unanswerable