Question 9 Select one answer. What is biodiversity? The variety of ecosystem typ

Question

Question 9

Select one answer.

What is biodiversity?

The variety of ecosystem types present within a region

Variation within a population’s or species’ gene pool

The variety of life at all levels, including all of the other options.

Question 4

Select one answer.

10 points

Which two activities are the main human activities that have led to increased levels of atmospheric carbon dioxide (CO2)?

breathing and decomposition

burning fossil fuels and clearing forests

livestock production and rice paddy agriculture

fertilizer use and natural gas extraction

Question 3

Select one answer.

10 points

The following are estimates from the U.S. Census Bureau’s International Database. They are averages for populations in two different groups of countries in 2012.

Group A: Total fertility 1.6 births per woman over a lifetime, life expectancy 78 years at birth, and population growth rate 0.3 % per year.

Group B: Total fertility 2.6 births per woman over a lifetime, life expectancy 66 years at birth, and population growth rate 1.3 % per year.

Which group do you think are the less developed countries, including most of Africa, Asia, and Latin America?

Group A nations are the less developed (lower income) nations.

Group B nations are the less developed (lower income) nations.

Question 9

Select one answer.

10 points

What is biodiversity?

The variety of ecosystem types present within a region

Variation within a population’s or species’ gene pool

The variety of life at all levels, including all of the other options

Explanation / Answer

1. The variety of life at all levels, including all of the other options.

Biodiversity is the variety of different types of life present on Earth, which refers to species variation, genetic variation and ecosystem variation within a region of Earth.

2. burning fossil fuels and clearing forests - increases atmospheric CO2 levels

livestock production and rice paddy agriculture - Increases atmospheric CO2 levels.

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