Why are bacteria required in the nitrogen cycle?
A. Nitrogen needs to be fixed before it is used by plants.
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B. The xylem in plants cannot function without bacteria.
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C. Plant DNA can only be transmitted by bacteria.
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D. Plants need to pull nitrogen directly from the air.

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.