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The current statement regarding oxygen availability in soft sediments is true: 

Hydrothermal vents are ephemeral ecosystems, that could be severely affected by ocean mining. 

For most marine organisms, diversity decreases as you are closer to the equator.

The study of the distribution of organisms in geographic space is called: 

What is the cause of flooding DAMAGE in plants that are not adapted to wetland environments?

The earth’s rotation has a significant and measurable effect on wind circulation and oceanic currents, named: 

Which plant phytochrome responses requires the highest intensity of light and the longest period of exposure to light, and is involved in flowering?

This hormone delays senescence.

Although optimal levels of auxin promote growth and inhibit leaf abscission, when auxin concentration get too high, the opposite things happen (growth is inhibited and abscission is promoted).  Which of the following explain the reason for these opposite effects?

What is the term for plants which are tolerant of relatively high salt concentrations in the soil?