What is permafrost? What will be an ideal ...

[MirandaLo]

What is permafrost?
 
  What will be an ideal response?

Question 2

An important characteristic of aquatic dead zones is a ________.
 
  A) low concentration of nitrogen and phosphorus nutrients
  B) low concentration of oxygen
  C) high concentration of organisms resulting in extreme competition and finally the death of most
  D) low concentration of keystone species
  E) high concentration of urban development

[af]

Answer to Question 1

Peremafrost is permanently frozen ground and is defined simply in terms of temperature (in other words, there doesn't actually have to be ice present).

Answer to Question 2

B