Which Factor Has Caused Primary Productivity in Amazon Forests to Decline

question 66

Multiple Choice

Which factor has caused primary productivity in Amazon forests to decline steadily over the past 30 years?

• A) ocean acidification
• B) nitrogen fixation
• C) soil runoff
• D) increasing droughts
• E) depletion of oxygen in the atmosphere

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Definitions:

Standard Form

A way of writing down very large or very small numbers conveniently, also specifically referring to the general representation of a linear equation as Ax + By = C.

Multiply

A mathematical operation that combines two quantities to produce a product.

Standard Form

A way of writing numbers, especially large numbers, by expressing them as a power of ten, or, in algebra, a way of writing equations.

Multiply

The operation of adding a number to itself a certain number of times, equivalent to repeated addition.