The body weight of offspring of bird species is range between 12 gm to 18 gm. In a laboratory experiment, species was subjected to selection pressure having influence on the offspring body weight. After many generations of experimental selection pressure, the body weight range between 14 gm to 16 gm. Which of the following natural selection operate on this species?

#Question id: 10699

#Unit 10. Ecological Principles

Two plant species co-occur in a prairie. Species X always occurs near species Y. However, species Y often occurs in isolation from species X and produces more seeds when alone than when growing next to species X. Which of the following interactions between species X and Y could generate this pattern?

#Question id: 10700

#Unit 10. Ecological Principles

Which of the following most important conclusion from the graph?

#Question id: 10701

#Unit 10. Ecological Principles

In community, two species A and B were found. A species have an especially large impact on the structure of entire communities because they are highly abundant while B species are not usually abundant in a community however; exert strong control on community structure by their pivotal ecological roles, or niches. Which of the following is naming of species?

#Question id: 10702

#Unit 10. Ecological Principles

Species A has a large effect on community because of its abundance in community known as

#Question id: 10703

#Unit 10. Ecological Principles

Keystone predators can maintain species diversity in a community if they

#Question id: 10704

#Unit 10. Ecological Principles

Imagine five forest communities, each with one hundred individuals distributed among four different tree species (W, X, Y, and Z). Which forest community would be most diverse?