By travelling at 40 kmph, a person reaches his destination on time. He covered two-third the total distance in one-third of the total time. What speed should he maintain for the remaining distance to reach his destination on time?

#Question id: 9238

#Unit 9. Diversity of Life Forms

Which of the following is a consequence of biological magnification?

#Question id: 9239

#Unit 9. Diversity of Life Forms

Why are changes in the global carbon cycle important?

#Question id: 9240

#Unit 9. Diversity of Life Forms

Use the following figure to answer the question.

Looking at the figure, what can you conclude about the data?

#Question id: 9241

#Unit 9. Diversity of Life Forms

The main goal of sustainable development is to ________.

#Question id: 9242

#Unit 9. Diversity of Life Forms

Eutrophication is often caused by excess limiting-nutrient runoff from agricultural fields into aquatic ecosystems. This process results in massive algal blooms that eventually die and decompose, ultimately depleting the dissolved oxygen, killing large numbers of fish and other aquatic organisms. Predict which of the following human actions would best address the problem of eutrophication near agricultural areas?

#Question id: 9243

#Unit 9. Diversity of Life Forms

Elevated carbon dioxide levels have been shown to contribute to the greenhouse effect, resulting in an increase in mean global temperature. Ecosystems where the largest warming has already occurred include snow-covered northern coniferous forests, tundra, and arctic sea ice habitats. Which statement best explains how the elimination of ice-covered ecosystems affects the rise or fall in global temperature?