Atmospheric carbon dioxide levels have been increasing gradually for many years. Scientists cite this increase as one of the main causes of climate change, which is a serious environmental problem for people all over the world. One component of a possible engineering solution to this problem is to use plants, algae, or phytoplankton to increase the global rate of photosynthesis. What scientific reasoning provides evidence that this solution could be effective?
A. Plants and other photosynthetic organisms change into fossil fuels over time.
B. Photosynthesis traps carbon dioxide in the soil.
C. Photosynthesis acts to remove carbon dioxide directly from the atmosphere.
D. Plants and other photosynthetic organisms provide food for consumers, who perform cellular respiration.

Which of the following is the most likely result of converting forestland to urban development? a.the amount of land available for lumber production decreases. b.fewer trees are needed because cities are made mainly of concrete. c.people discover more efficient ways to grow trees. d. the price of lumber goes down.

In tossing one coin 10 times, what are your chances for tossing a head? a tail? 2. in tossing one coin 100 times, what are your chances for tossing a head? a tail? 3. in tossing one coin 200 times, what are your chances for tossing a head? a tail? deviation = ((absolute value of the difference between expected heads and observed heads) + (absolute value of the difference between expected tails and observed tails)) divided by total number of tosses. this value should always be positive. 4. what is the deviation for 10 tosses? 5. what is the deviation for the 100 tosses? 6. what is the deviation for 200 tosses? 7. how does increasing the total number of coin tosses from 10 to 100 affect the deviation? 8. how does increasing the total number of tosses from 100 to 200 affect the deviation? 9. what two important probability principles were established in this exercise? 10. the percent of occurrence is the obtained results divided by the total tosses and multiplied by 100%. toss the coins 100 times and record your results. calculate the percent occurrence for each combination. percent head-head occurrence: percent tail-tail occurrence: percent head-tail occurrence:

The arrows indicate the direction of wind flow. which place experiences monsoons?