Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief ________.

TLS Online TPP Program

#Question id: 11995

#Unit 10. Ecological Principles

You are working for the Environmental Protection Agency and researching the effect of a potentially toxic chemical in drinking water. There is no documented scientific evidence showing that the chemical is toxic, but many suspect it to be a health hazard. Using the precautionary principle, what would be a reasonable environmental policy?

TLS Online TPP Program

#Question id: 11996

#Unit 10. Ecological Principles

Which of the following statements best describes the difference in approach to studying the environment by early naturalists compared to present-day ecologists?

TLS Online TPP Program

#Question id: 11997

#Unit 10. Ecological Principles

Which statement best contrasts environmentalism with ecology?

TLS Online TPP Program

#Question id: 11998

#Unit 10. Ecological Principles

Of the following examples of ecological effect leading to an evolutionary effect, which is most correct? 

TLS Online TPP Program

#Question id: 11999

#Unit 10. Ecological Principles

Rachel Carson would most likely have endorsed which of the following statements?

TLS Online TPP Program

#Question id: 12000

#Unit 10. Ecological Principles

The graph below shows  the  growth  rates  of  populations  of  bacteria  that  have  evolved  for  many  generations  at different culture temperatures (25°C, 30°C, and 35°C). Each population grows over only a limited range of temperatures (its thermal niche), which are bounded by its critical thermal limits. Within this range, growth rate increases with temperature up to a maximal value and then declines rapidly with increasing temperature. Growth rates are known to be the major determinant of fitness for these bacteria.

Which of the following is true concerning the thermal dependence of growth rate   between 25°C and 30°C in these populations?