Question

19)__the reduction of the ozone layer is caused by a)burning fossil fuels. b)acid precipitation. c)heavy metals. d)cfcs. 21)acid precipitation a)may decrease biodiversity on land. b)has no effect on biodiversity. c)may increase biodiversity in water. d)both a and c. 22)the greatest source of air pollution is a)volcanic eruptions. b)forest fires. c)burning fossil fuels. d)cfcs. 23)habitat fragmentation often leads to a)increased species diversity b)larger habitats for species. c)decreased species diversity within an area. d)an increased food supply for species. use the word - bank to complete the statements. not all words will be used. increase species space decrease greater biological diversity environments equator less variety (24)refers to the (25)of life in an area. another word for biological diversity is biodiversity. the simplest measure of biodiversity is the number of (26)that live in a certain area. the more species there are, the (27)is the biodiversity of the area. biodiversity on land tends to (28)as you move toward the (29). biodiversity is greater on large islands than small islands because large island have more (30)and a greater variety of (31)match column a to column b. column a column b 32)this animal is an example of a threatened species. a) endangered species 33)all members of a species have died, so the species no longer exists. b) threatened species 34)this animal is an example of an extinct species. c) black rhinoceros 35)the population of a species begins declining rapidly. this animal is an example of an endangered species. d) african elephant 36)__the number of members of a species is so low that there is a possibility of extinction. e) extinct species f) carrier pigeons

Explanation:

1. Chlorofluorocarbons (CFCs) are known to cause ozone - layer depletion.
2. Acid precipitation can harm plants and animals on land and in water, decreasing biodiversity.
3. Burning fossil fuels releases large amounts of pollutants like sulfur dioxide, nitrogen oxides etc. which is a major source of air pollution.
4. Fragmenting habitats reduces the size of habitats for species and often leads to decreased species diversity within an area.

24 - 31) Biological diversity refers to the variety of life in an area. The simplest measure is the number of species. Biodiversity is greater near the equator and on large islands due to more space and variety of environments.
32 - 37) The black rhinoceros is a threatened species. Carrier pigeons are extinct. African elephants are sometimes considered endangered. An endangered species has a rapidly declining population and a threatened species has a population at risk of extinction.

Answer:

1. d. CFCs
2. D. both a and c
3. C. burning fossil fuels
4. C. decreased species diversity within an area
5. Biological diversity
6. variety
7. species
8. greater
9. increase
10. space
11. biological diversity
12. environments
13. C. Black rhinoceros
14. E. extinct species
15. F. carrier pigeons
16. A. endangered species
17. D. African elephant
18. B. threatened species