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

1. Introduction to Biology

Natural Selection and Evolution

General Biology

1. Introduction to Biology

Natural Selection and Evolution

Previous problemNext problem

Struggling with General Biology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following best explains a significant decrease in a moose population observed between 1995 and 1997?

A sudden mutation caused all moose to become infertile.

An increase in wolf predation reduced the number of moose.

The moose population migrated to a new habitat with more resources.

Photosynthesis rates in the forest increased, providing more food for moose.

Previous problemNext problem

Verified step by step guidance

Step 1: Begin by identifying the key factors that could influence a population decrease in moose. These factors typically include predation, disease, habitat changes, food availability, or reproductive issues.

Step 2: Evaluate the first option, 'A sudden mutation caused all moose to become infertile.' While mutations can impact reproduction, it is highly unlikely for a sudden mutation to affect an entire population simultaneously. This option is not biologically plausible.

Step 3: Consider the second option, 'An increase in wolf predation reduced the number of moose.' Predation is a common ecological factor that can significantly reduce prey populations. If wolf predation increased during this time, it could explain the observed decrease in moose population.

Step 4: Analyze the third option, 'The moose population migrated to a new habitat with more resources.' While migration can impact local population numbers, it would not necessarily explain a significant decrease unless the migration was accompanied by other factors like predation or environmental stress.

Step 5: Examine the fourth option, 'Photosynthesis rates in the forest increased, providing more food for moose.' Increased photosynthesis would likely lead to more food availability, which should support population growth rather than a decrease. This option does not align with the observed population trend.