Living world (ecosystems)

Rising global temperatures rapidly melt glaciers and permafrost in cold environments, disrupting fragile ecosystems and releasing trapped greenhouse gases. While volcanic eruptions (Option D) can cause localized damage, they are natural events and not the primary driver of the widespread, systemic threats facing polar regions today.

Amazonian deforestation is primarily driven by commercial activities like cattle ranching, agriculture, and mining, which clear vast areas of land for economic gain. While tourism (Option D) causes some localized impact, it is not a major driver of large-scale forest clearance compared to agriculture and logging.

Rainforests thrive in equatorial regions with constant warmth and heavy precipitation, hosting diverse species under a thick canopy, though heavy rains leach nutrients from the soil. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Option A is incorrect because rainforests require high annual rainfall to sustain their dense, lush vegetation.
• !Hot deserts receive very little precipitation and experience extreme daily temperature fluctuations due to the lack of cloud cover to trap heat at night.
• !While volcanic eruptions (Option D) can cause localized damage, they are natural events and not the primary driver of the widespread, systemic threats facing polar regions today.

Answer each from memory — you'll see instantly whether you're right and why.

Run a focused 10-question mini-mock on Living world (ecosystems) and see it stick.