Which statement best describes aquaponics? 

A)  It involves removing oxygen from a body of water. 
B)  It involves raising fish with plants. 
C)  It involves organic feed for the fish 
D)  It involves raising fish in tanks on land.

According to the graph,is it true that higher GDP PPP per capita is related to greater infant mortality?

While observing beetles that can raise their abdomens and give off a defensive chemical that repels predators,an entomologist discovers a different species of beetle that also raises its abdomen but gives off no defensive chemical.What is the second beetles' defensive behaviour called? 

A)  chemical warfare 
B)  camouflage 
C)  flight mechanism 
D)  mimicry

What is urban sprawl?

The huge 1964 Alaskan earthquake, one of the largest earthquakes ever recorded, was caused by:

A) rupture on a long segment of a strike-slip fault
B) normal faulting on an ancient fault zone in the crust
C) thrusting along a subduction zone megathrust)
D) an underwater landslide that caused a tsunami
E) a volcanic eruption on Augustine volcano

What is the primary limiting factor of the rain forest? 

A)  temperature 
B)  soil nutrients 
C)  water 
D)  light

Which letter in the graph corresponds to the portion of the curve that results from reproductive time lag?

Which letter in the diagram corresponds to the point at which all the sludge is combined before being dried?

Which of the following is NOT a likely outcome of a rise in sea levels? 

A)  contaminated coastal aquifers 
B)  healthier coral reefs 
C)  flooding of the areas containing one-third of the world's population 
D)  accelerated coastal erosion

What influences oxygen levels in the water? 

A)  Sewage run-off has little adverse effect on oxygen levels. 
B)  Inorganic nutrients such as fertilizers increase oxygen levels. 
C)  Organic wastes reduce the amount of oxygen in the water supply. 
D)  Heat can increase dissolved oxygen and make fish less vulnerable to disease.