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2. 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
Figure 3-6
3. Look at the graph in Figure 3-6. Approximately how many hours of sunlight should these plants receive each day in order to make them grow at their optimum level?
(1 point)
4
12
16
20
4. Water temperature and light are two ____________________ factors that affect the tolerance range of organisms in a lake.
(1 point)
5. Tropical rain forest and ____________________ biomes are both characterized by a thin layer of nutrient-poor topsoil that can support only shallow-rooted plants.
(1 point)
6. Fires, natural disasters, and human intervention are possible causes of ____________________.

so my bio teacher is pretty much saying i suck at life cause i cant get the answers right.
1) Choose an animal and give an example of it habitat and niche
2) Describe the climate of the desert
3) define mitosis, define meiosis and then explain how they are alike and how they are different
4) define Biodiversity….Explain the importance of biodiversity
5) What is the difference between sexual and asexual reproduction
6) Compare and contrast primary and secondary succession?
7) How do cells become cancerous? (explain the cellular process and list 3 risk factors)
8) What is a mutation
9) Compare and contrast primary and secondary succession.
thats it…. thanks. Ive been stressing out about this cause i only have till tomorrow and i was supposed to be done few weeks ago and blah blah blah and you dont care so bye and thanks.

Im a bit confused about these questions and would very much appreciate it if you could help me out a little bit please?
Thanks!
1. Succession
In 1908, a meteoroid or cometary body exploded above boreal forest of Tunguska in central Siberia, resulting in the largest impact event over land in Earth’s recent history. How might succession have differed after this event compared to a forest fire in terms of succession type and the timescale of reaching a climax community?
2. Niche
A realized niche describes the niche occupied by an organism in the presence of other competing species.
True/False
3. Genetic variability & evolution
(a) Why does evolution require the presence of genetic variability?
(b) Why is genetic variability not sufficient for evolution (i.e. what else is needed for evolution to occur)?
4. Convergent evolution
Convergent evolution can be found when two separate and distinct species evolve similar traits as a result of adaptation to selective pressures from similar environment. Find an example (not mentioned during class) of two species that followed convergent evolution. Justify your answer giving the name of both ancestor species and why you consider they are a good example of convergent evolution.
5. threats to biodiversity
(AM) What are the 4 of the most important threats to biodiversity? List them in descending order of importance.

A. the organisms may have to compete directly
B. one organism usually migrates to a new habitat
C. the two organisms will always form a symbiotic relationship
D. both organisms will disappear from the habitat
In his experiments with two species of paramecia, G. F. Gause proved that two competitors cannot coexist on the same limited resources. This outcome demonstrated the principle of
A. symbiosis
B. intraspecific competition
C. succession
D. competitive niche
When two species compete, the niche that each species ultimately occupies is its
A. competitive niche
B. exclusive niche
C. fundamental niche
D. realized niche

1. What is the scientific method? What are the steps used in the method?
2. Define controlled experiment, control group & variable?
3. Name 4 important lab safety rules.
4. What is Biology?
5. Name the 8 characteristics of life.
6. Know microscope parts & functions, how do you figure out total magnification?
7. What is the difference between a solid, liquid, and a gas?
8. What is an atom & what 3 particles are found inside an atom?
9. Why is water a polar molecule?
10. What is the pH range of base? Acid?
11. What is a buffer?
12. What element do ALL organic compounds contain? What makes this element special?
13. Define carbohydrate, monosaccharide & polysaccharide.
14. Contrast dehydration synthesis & hydrolysis.
15. Define lipid. What monomers are they made of? How does one differ from another?
16. Contrast saturated lipids & unsaturated lipids.
17. Define sterols & phospholipids. Where do we find each?
18. What elements do proteins contain? What monomers make up proteins?
19. What do enzymes do? Define substrate & active site.
20. What makes up an amino acid? How does one differ from another?
21. Define peptide bond & polypeptide.
22. What elements make up a nucleic acid? What are the monomers of nucleic acids?
23. Who is Hooke? Leeuwenhoek? What did they do?
24. What organelles do plants have that animals do not? What is each used for?
25. What is the cell theory?
26. What is ATP?
27. Why is ATP important?
28. Define cell & organelle. Give 3 examples of organelles & what they do?
29. Contrast prokaryotic & eukaryotic cells.
30. What is the Fluid Mosaic Model?
31. Define diffusion, osmosis & concentration gradient.
32. Define exocytosis, endocytosis, phagocytosis & pinocytosis.
33. What is equilibrium?
34. Contrast passive & active transport.
35. If a cell is in a hypertonic solution, which way will water move? What about a hypotonic solution?
36. Define cytokinesis. How is it different in plants and animals?
37. What determines how quickly materials enter and leave a cell?
38. What are chromosomes made up of?
39. A cell contains 15 chromosomes, how many will it have after mitosis?
40. At the beginning of mitosis, what does a chromosome consist of?
41. Define centromere, chromatid, and chromatin.
42. Name the phases of mitosis. What happens in each? Draw a sketch of each.
43. What phase of interphase is DNA replicated in?
44. As you move from Kingdom to Species, organisms become MORE or LESS similar.
45. Who came up with the 2 name system of genus and species?
46. Felis domesticus. Which name is the genus?
47. Give 2 reasons why scientists don’t use common names. What language is used?
48. What is the correct order of the biological hierarchy from kingdom to species?
49. Define a cladogram.
50. Define a community
51. What does an ecosystem consist of?
52. What is the difference between a niche and a habitat?
53. What are organisms that manufacture organic nutrients for an ecosystem called?
54. What is the primary producer in a cow pasture?
55. What happens to nitrogen when an organism dies?
56. In a food web, which type of organism receives energy from every other type?
57. In an energy pyramid, where do you find the most energy? The bottom or the top?
58. Water and minerals needed by all organisms on Earth are recycled through the ___________ cycles.
59. Precipitation and evaporation are important components of the ________ cycle.
60. Decomposition, bacteria, ammonia and fixation are part of what cycle?
61. Proteins are made up of this important organic compound that is involved in a biogeochemical cycle.
62. Name 3 things that come from decayed plants, are fossil fuels, and release carbon dioxide when they are burned.
63. When humans burn fossil fuels, destroy vegetation that absorbs carbon dioxide, and clear cut forests, we are impacting the _______ cycle.
64. Populations grow because the ________ rate is higher than the ________ rate.
65. As a population reaches its carrying capacity, there may be an increase in competition for these 3 things:
66. Human population growth is currently most rapid in developed/developing countries?
67. _____________ coevolve with their hosts, are usually smaller than their hosts, and rarely kill their hosts.
68. What is competitive exclusion?
69. Give an example of mutualism and commensalism.
70. Define succession.
71. What kind of succession occurs after a forest fire?
72. When a previously existing community is replaced, this is called ____________ succession.
73. Scientists strongly suspect that temperatures are increasing on Earth because increasing______________ in the atmosphere is trapping more heat. This is called the ________________ effect.
74. Pines, spruces and firs are examples of ___________.
75. Pollen is produced in the ________.
76. What is the male part of the flower?
77. What is the female part of the flower?

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**