Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively . If they cross each other in 23 seconds, what is the ratio of their speeds?

TLS Online TPP Program

#Question id: 12152

#Unit 10. Ecological Principles

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

TLS Online TPP Program

#Question id: 12153

#Unit 10. Ecological Principles

Which of the following is not a resource? 

TLS Online TPP Program

#Question id: 12154

#Unit 10. Ecological Principles

What is true of two resources that act synergistically to determine the population growth of a particular species? 

TLS Online TPP Program

#Question id: 12155

#Unit 10. Ecological Principles

Under which of the following conditions do the mathematical models for competition tell us that coexistence of two competing species is most likely? 

TLS Online TPP Program

#Question id: 12156

#Unit 9. Diversity of Life Forms

Which of the following correctly pairs a protist with one of its characteristics?

TLS Online TPP Program

#Question id: 12157

#Unit 9. Diversity of Life Forms

Which of the following statements concerning protists is false?