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Making a study guide.
1. Predict the change in an ecosystem if an organism is removed or introduced.
2.Describe how the biological concept of a niche helps reduce competition.
3 What is colonization?
4.Communicate the need to prevent animal extinction.
5.Identify the ecological succession as a series of changes in a community in which new populations of organisms gradually replace existing ones form colonization to climax community and through secondary succession after a disaster.
Thanks to all that help!

two stars beside mine im trying to do really well so i chose the ones that i can remember and the ones that i cant i tried to best guess
1.
Sea stars live in saltwater ecosystems. Some species live in shallow tidal pools, while others live in the deepest parts of the oceans. This is a description of the ____ of sea stars. (1 point)
* habitat**
* community
* niche
* none of these
2.
Cougars are predators that often eat weakened or diseased animals. This is a description of the _____ of cougars.
(1 point)
* habitat
* community
* niche**
* none of these
3.
Nitrogen is released to the abiotic parts of the biosphere from the processes of death and _______. (1 point)
* decay by bacteria**
* infiltration of groundwater
* runoff
* lightning in storm clouds**
4.
Referring to Figure 2-1, energy flows from ______.
Figure 2-1 Energy Flow
Figure 2-1 (1 point)
* coyotes to grasses
* cats to mice
* mice to cats**
* coyotes to cats
5.
Carbon dioxide in the atmosphere enters the biotic parts of the biosphere through _______. (1 point)
* burning of forests
* photosynthesis
* combustion of fossil fuels
* all of these**
6.
What type of cycle is depicted in Figure 2-10?
Figure 2-10 Cycle (1 point)
* carbon
* water**
* phosphorus
* nitrogen
7.
Which organism shown in the pyramid shown in Figure 2-9 receives the highest percentage of energy from the sun?
Figure 2-9 Pyramid
(1 point)
* fox
* birds
* grasshoppers
* grass**
8.
A girl notices her guppies reproduce most when her fish tank water is slightly alkaline. They stop reproducing if the water becomes acidic or if the water becomes too alkaline. This is an example of ____. (1 point)
* secondary succession
* zones of tolerance and intolerance
* communities
* intertidal zones**
9.
The stable ecosystem that develops due to succession ______. (1 point)
* is called a niche
* is always a forest
* is called a climax community**
* never changes
10.
What type of succession is most likely to happen in a burned forest? (1 point)
* primary
* secondary**
* tertiary
* climax
11.
You take a sample of species from the area labeled A in Figure 3-7. What would you expect to find?
Figure 3-7 Pond Ecosystem (1 point)
* almost no life
* great species diversity
* organisms that need very little oxygen
* one dominant species of fish**
12.
What type of species would be most likely found in the area labeled D in Figure 3-7? (1 point)
* one that requires plenty of oxygen
* plants that require light
* amphibians that need a warm habitat**
* decomposers that feed on dead organisms
13.
The absence of permafrost and the presence of coniferous trees as the dominant climax plants characterize the ________. (1 point)
* taiga
* tundra
* grassland
* desert**
14.
The first organisms to appear in an area undergoing succession are known as ________. (1 point)
* predators
* pioneer species
* parasites
* organisms**