Organisms evolve over generations to become adapted to the environmental conditions to which they are exposed. The diversity of organisms that

occurs in any particular area thus may be largely determined by the abiotic factors limiting survivorship and reproduction of organisms in a region. Which of the following limit the range of Saguaro cactus in North America?

I) pollinators

II) sunlight

III) precipitation

IV) temperature

TLS Online TPP Program

#Question id: 12233

#Unit 10. Ecological Principles

Monarch butterflies are protected from birds and other predators but the cardiac glycosides they incorporate into their tissues are from eating milkweed when they were in their caterpillar stage of development. The wings of a different species of butterfly, the Viceroy, look nearly identical to the Monarch so predators that have learned not to eat the bad-tasting Monarch avoid Viceroys as well. This example best describes

TLS Online TPP Program

#Question id: 12232

#Unit 10. Ecological Principles

White-breasted nuthatches and Downy woodpeckers both eat insects that hide in the furrows of bark in hardwood trees. The Downy woodpecker searches for insects by hunting from the bottom of the tree trunk to the top, while the White-breasted nuthatch searches from the top of the trunk down. These hunting behaviours best illustrate which of the following ecological concepts?

TLS Online TPP Program

#Question id: 12231

#Unit 10. Ecological Principles

Which of the following studies would a community ecologist undertake to learn about competitive interactions? 

TLS Online TPP Program

#Question id: 12229

#Unit 10. Ecological Principles

Community ecologists would consider which of the following to be most significant in understanding the structure of an ecological community?

TLS Online TPP Program

#Question id: 12228

#Unit 10. Ecological Principles

Which of the following examples best describes an ecological community?

TLS Online TPP Program

#Question id: 12227

#Unit 10. Ecological Principles

During the course of the formation of a parasite/host relationship, a critical first step in this evolution would be