3. In an ecosystem, different organisms interact with each other.
What evidence from the passage supports this statement?
A. Plants use sunlight, water, and carbon dioxide in a process called photosynthesis.
B. Forest ecosystems cover about a quarter, or one-fourth, of the total land surface in the
world.
C. Producers are living things that can make their own energy out of non-living
resources.
D. A deer decomposing in the soil provides food for bacteria and nutrients for plants to
grow.
4. Based on the information in the passage, what do all ecosystems have in common?
A. All ecosystems are home to living beings that interact with each other.
B. All ecosystems are home to trees, deer, humans, rodents, wolves, hawks, and
bacteria.
C. All ecosystems have an equal number of consumers, decomposers, and producers,
D. All ecosystems have a few consumers that do not interact with decomposers and
producers.

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:

Most of the carbon on earth is stored in the form of

Which coal field location is related to coal fields in the eastern united states and supports the theory of continental drift? eastern india southern africa western australia northern south america