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Which is not true of historical pesticide use?

You find an organism living at the bottom of a freshwater lake, the benthos zone. What does this indicate to you about that organism?           

A rapid dieback in the population to a level below the carrying capacity.

Which is not true of emergent diseases?

Which is not true of soil?

Exponential population growth is at a constant rate of increase per unit time (geometric).

Plants grow better in a Micorrhizal symbiosis because the fungus provides glucose to the plant and the plant provides water and inorganic nutrients to the fungus.

The natural increase of a population is defined as

A country with an age structure with many pre-reproductives, fewer reproductives and even fewer post-reproductives has population momentum (the population continues to grow even if fertility rates fall).

What is the number of children needed per couple in more-developed nations to have zero population growth?