Homework Help: Biology

Posted by Anonymous on Sunday, September 13, 2009 at 2:56pm.

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?

Thnak You ! =]

Biology - Anonymous, Wednesday, October 14, 2009 at 12:52am
The portion of Earth that supports existence of living things is called the-
C. Biosphere!
Biology - reggy, Friday, October 7, 2011 at 12:42pm
C. biology

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