Question

1. what causes the edge effect in habitats?

a. destruction of habitat
b. eutrophication
c. biological magnification
d. fragmentation of habitat

1. which organisms are affected most by biological magnification?

a. wolves
b. plants
c. algae
d. mice

1. which defines background extinction?

a. an accelerated extinction rate
b. extinctions of unknown species
c. mass extinctions in the past
d. the natural extinction rate

Explanation:

1. Edge - effect in habitats is mainly caused by habitat fragmentation. Fragmentation creates new edges in habitats.
2. Small - sized organisms like algae are most affected by biological magnification as they are at lower trophic levels and accumulate toxins.
3. Background extinction is the normal rate of extinction that occurs in the absence of major catastrophic events.

Answer:

1. d. Fragmentation of habitat
2. c. Algae
3. d. The natural extinction rate