Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 6m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 53m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport1h 2m
- Water Potential
  1h 2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

53. Conservation Biology

Conservation Biology

General Biology

53. Conservation Biology

Conservation Biology

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0:36 minutes

Problem 4

Textbook Question

What is the primary threat in marine environments?

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Identify the various threats to marine environments, such as pollution, overfishing, climate change, habitat destruction, and invasive species.

Evaluate how each threat impacts marine life and ecosystems. For example, pollution can lead to water contamination and affect the health of marine organisms.

Consider the global and long-term effects of climate change, such as ocean acidification and rising sea temperatures, which can lead to coral bleaching and disrupt marine biodiversity.

Analyze data and research studies that compare the impact levels of different threats to determine which is currently having the most significant negative effect on marine environments.

Conclude which threat is the primary one based on the severity and extent of its impact on marine ecosystems and biodiversity.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Ocean Acidification

Ocean acidification refers to the decrease in pH levels of the ocean due to the absorption of excess atmospheric CO2. This process negatively impacts marine life, particularly organisms with calcium carbonate structures, such as corals and shellfish, making it harder for them to grow and survive.

Overfishing

Overfishing occurs when fish and other marine species are caught at a rate faster than they can reproduce. This leads to population declines, disrupts marine ecosystems, and threatens the livelihoods of communities that depend on fishing, making it a significant threat to marine biodiversity.

Pollution

Pollution in marine environments includes the introduction of harmful substances, such as plastics, chemicals, and nutrients, into the ocean. This can lead to habitat degradation, toxic algal blooms, and the death of marine organisms, severely impacting the health of marine ecosystems.

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Related Practice

Textbook Question

What is a biodiversity "hotspot"?

a. An area where an all-taxon survey is under way

b. An area where an environmental sequencing study has been completed

c. A habitat with high NPP

d. An area with high species richness and high threat to those species

1126

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Textbook Question

The burning of fossil fuels ________.

a. Releases carbon dioxide to the atmosphere.

b. Primarily occurs as a result of human activity.

c. Is contributing to global warming.

d. Is possible thanks to photosynthesis that occurred millions of years ago.

e. All of the above are correct.

2171

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Textbook Question

Current rates of species extinction appear to be approximately

a. Equal to

b. 10 times lower than

c. 10 times higher than

d. 50 to 100 times higher than

e. 1000 to 10,000 times higher than

1506

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Textbook Question

Which of the following is characteristic of endemic species?

a. They are often found in biodiversity hot spots.

b. They are distributed widely in the biosphere.

c. They require edges between ecosystems.

d. They are often keystone species whose presence helps to structure a community.

1284

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Textbook Question

Which of the following strategies would most rapidly increase the genetic diversity of a population in an extinction vortex?

a. Establish a reserve that protects the population's habitat

b. Introduce new individuals transported from other populations of the same species

c. Sterilize the least fit individuals in the population

d. Control populations of the endangered population's predators and competitors

1127

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Textbook Question

Ospreys and other top predators are most severely affected by pesticides such as PCBs because they

a. Are especially sensitive to chemicals.

b. Have very long life spans.

c. Store the pesticides in their tissues.

d. Consume prey in which pesticides are concentrated.

809

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Textbook Question

Why is the common phrase "humans and animals" not accurate in biology? Suggest one way that a more scientific outlook could boost conservation efforts.

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Textbook Question

Which cause of extinction results from humans' direct use of a species?

a. Overexploitation

b. Habitat fragmentation

c. Pollution

d. Introduction of competitors or predators

e. Global warming

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