Human Activity

Question 1

Removal of natural vegetation which causes the underground water table to rise. This pushes the salt to the surface. Greatly reduces biodiversity and can make the land completely unhabitable.

Answer 1

Salinity

Question 2

When once continuous habitats become separated from one another. Small habitats can only support small populations making organisms more vulnerable to extinction.

Answer 2

Fragmentation

Question 3

Can be introduced unknowingly or deliberately. They pose a major threat to ecosystems, as they often have no natural predators and compete with native species for resources

Answer 3

Introduced Species

Question 4

How can human activity impact the biosphere?

Answer 4

Habitat Destruction
European settlement and introduced species
Water flow
Fishing
Climate change
Global warming
Biomagnification

Question 5

Highly persistent pesticides, which cannot be metabolized or excreted, and are stored and accumulate in the fatty tissues of organisms.

Answer 5

Biomagnification