Repost- Biology

Will someone please help me out.. I have been posted these questions for 7 hours .. but no one has helped me out..please help me out..I got to figure it out within today..please..

1. Which of the following is a biotic factor that might affect the life of a water-dwelling organism?
A. Temperature of the water
B. Speed of water current
C. Pollutions in water
D. Bacterial population in water
My guess: D?

2. Which of the following things does NOT allow plants to obtain atmospheric nitrogen in a more usable form?
A. Photosynthesis
B. Lightning
C. Symbiotic bacteria
D. Chemical fertilizers
My guess: A?

3. How does the amount of water on Earth change as a result of the water cycle?
A. It always increases
B. It alternately increases and decreases
C. It remains constant
D. It always decreases
My guess: C?

4. Are the third-order heterotrophs consumed by gungal decomposers?
My guess:Yes?

5. Which of the following fixes atmospheric N2 (nitrogen gas)?
A. photosynthesis
B. symbiotic bacterianon the roots of legumes
C. uv light
D. decay organisms
E. autotrophs
My guess: B?

6. Which ecological pyramid best explains why food chains are typically only three or four links long?
A. Pyramid of biomass
B. Pyramid of energy
C. Pyramid of numbers
D. None of the above
My guess: B? Because only around 10% of the energy will released to the next level?

Any help will be appreciated!

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asked by Anonymous
  1. I don't know number 4. The rest are correct.

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    posted by bobpursley
  2. Oops.. typo for #4.. It should be..
    Are the third-order heterotrophs consumed by fungal decomposers?
    My guess:Yes?
    Anyway, thanks,bobpursley!

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    posted by Anonymous

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