Why Is Cattle Ranching Not Sustainable in Areas That Were

question 93

Multiple Choice

Why is cattle ranching not sustainable in areas that were formerly tropical forests?

• A) Cattle waste damages rainforest soils.
• B) Cattle ranching quickly exhausts the nutrient-poor soil of tropical rainforests.
• C) Tropical grasses are toxic to cows.
• D) Cattle ranching exhausts the nutrient-poor soils in tropical rainforests and cattle waste damages rainforest soils
• E) Tropical grasses are toxic to cows and cattle waste damages rainforest soils

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Definitions:

Inhibitory PSPs

Post-synaptic potentials that make a post-synaptic neuron less likely to generate an action potential.

Absolute Refractory Period

A period immediately following the firing of a nerve fiber when it cannot be stimulated for a brief period, regardless of how strong the incoming stimulus may be.

Relative Refractory Period

A period shortly after the firing of a nerve during which the nerve cannot be stimulated to fire again at its maximum rate, but can still respond to a stronger than usual stimulus.

Firing Rate

The frequency at which a neuron discharges electrical impulses over a certain period of time.