The answers are:
1. The dependent variable is distance as it varies with the reading time interval of 30 minutes.
2. The independent variable is the elapsed time with a fixed interval of 30 minutes.
3. Natalie had run approximately 8 Km in 40 minutes, marked in the graph. So she must have run, 15-8=7 Km after 40 minutes.
4. To calculate: Average speed, Given: Total distance = 15 Km, Total time elapsed = 150 minutes.
Time in hours will be 

The cells of seed plants are organized into tissues and organs. The three main plant organs are roots, stems, and leaves.
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Answer: a membrane containing a larger proportion of unsaturated fatty acids
Explanation:
The answer to this question is:
<span>Sodium's atomic number is 11 what does that tell you about an atom of sodium?
</span><span>B-"it contains 11 protons"
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