Question

question 7 of 10
in what way are the rain forests in south america, asia, and africa alike?
a. they are home to the same exotic animals.
b. they are growing at the expense of more modern ways of life.
c. they are sources of oil and other fossil fuels.
d. they help clean the earths atmosphere.

Explanation:

Rainforests play a crucial role in the global ecosystem. Through the process of photosynthesis, trees in rainforests absorb carbon dioxide (\(CO_2\)) and release oxygen (\(O_2\)). Carbon dioxide is a greenhouse gas, and by absorbing it, rainforests help in reducing the concentration of this gas in the atmosphere. This process is essential for maintaining the balance of gases in the earth's atmosphere, which is a common function among rainforests in different continents like South America (e.g., Amazon rainforest), Asia (e.g., rainforests in Southeast Asia), and Africa (e.g., Congo rainforest).

Now let's analyze each option:

• Option A: Rainforests in different continents have different species of exotic animals due to factors like geographical isolation, evolution in different environments etc. For example, the Amazon has jaguars, while Asian rainforests have tigers. So this option is incorrect.
• Option B: In reality, rainforests are being deforested (shrinking) at an alarming rate due to activities like logging, agriculture expansion (to meet modern demands for food, etc.), not growing. So this option is incorrect.
• Option C: Rainforests are not sources of oil and other fossil fuels. Fossil fuels are formed from the remains of marine organisms (for oil, natural gas) and plants (for coal) that were buried and underwent geological processes over millions of years in sedimentary basins, not directly from rainforest biomass in their current state. So this option is incorrect.
• Option D: As explained above, through photosynthesis, rainforest trees absorb \(CO_2\) (a pollutant in terms of its role in climate change when in excess) and release \(O_2\), thus helping to clean the earth's atmosphere. This is a common and important function of rainforests across South America, Asia, and Africa.

Answer:

D. They help clean the earth's atmosphere.