###### Question:

All the contributors to the generation of oxygen to the atmosphere reside in the _____________ zone of the ocean.

A. benthic
B. sublittoral
C. littoral

D. euphotic

What is a typical feature of rooted or floating aquatic plants?

A. always depend on water currents for pollination
B. petioles and stems contain large aerenchyma tissues
C. narrow and tender leaves to withstand water currents

D. leaves float at the surface of water

What is meant by the word 'sustainability'

A. returning the natural environment to pre-industrial conditions
B. increasing agricultural output to feed the growing human population
C. preventing excessive urban developments

D. maintenance of a healthy environment and reasonable standard of living

Millions of acres of spruce trees have been killed due to an explosive increase in spruce bark beetles in recent years, and scientists suggest global warming as the underlining cause. How could this be related to global warming?

 A. longer, warmer seasons have resulted in increased beetle populations. B. spruce is more susceptible to beetles at high temperatures. C. global warming is the cause of acid rain, and the trees are being weakened. D. spruce bark beetles did not attack spruce trees until the Industrial Revolution.

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