Ecosystem diversity & Natural Ecosystem Changes

Question 1

biodiversity

Answer 1

number and variety of organisms in ecosystem, also variability between species

Question 2

benefits of biodiversity

Answer 2

gives species greater chance of survival; aesthetic appeal; human health and pharmaceuticals; more types of agriculture

Question 3

keystone species

Answer 3

very important, extinction would lead to extinction of many other species

Question 4

indicator species

Answer 4

used to measure health of ecosystem, sensitive

Question 5

indigenous species

Answer 5

occur naturally in an area

Question 6

invasive species

Answer 6

alien, exotic, introduced species

Question 7

pioneer species

Answer 7

species in first stages of primary or secondary succession

Question 8

climax community

Answer 8

final stage of succession

Question 9

ecological succession

Answer 9

the process by which organisms occupy a site and gradually change environmental conditions b
creating soil, shade, shelter, or increasing humidity

Question 10

primary succession

Answer 10

occurs when a community begins to develop on a site previously
unoccupied by living organisms

Question 11

secondary succession

Answer 11

occurs when an existing community is disrupted and a new one

subsequently develops at the site

Question 12

conservation of matter

Answer 12

states that matter is neither created nor destroyed when a

physical or chemical change occurs