When immigration from large, productive subpopulations keeps declining subpopulations from dwindling to extinction, the phenomenon is called the __________. 

#Question id: 9211

#Section 2: Evolution

Of the following ecosystem types, which have been impacted the most by humans?

#Question id: 10680

#Section 1: Ecology

Which of the following organism usually show exploitation competition?

#Question id: 3489

#Section 4: Behavioural Ecology

 In a bird species A, the male alone builds the nest, incubates the eggs and feeds the nestling. In bird species B, it is the female that does all that. In bird species C, both sexes contribute equally to the above activities. In species A and B, the uninvolved partner may fly away and mate again. Which sex among A, B and C is most likely to develop colorful plumage during breeding season?

#Question id: 4648

#Section 2: Evolution

In a hypothetical environment, fishes called pike-cichlids are visual predators of algae-eating fish (i.e., they locate their prey by sight). If a population of algae-eaters experiences predation pressure from pike-cichlids, which of the following should least likely be observed in the algae-eater population over the course of many generations?

#Question id: 11056

#Section 2: Evolution

The "dead-leaf" butterfly is aptly named. This is an example of what kind of defense against predation?