Species Extinction and Adaptation | Extinct Animals | Grade 9 Science Quarter 1 Week 6
Introduction
The video is an introduction to the topic of species extinction and adaptation in grade 9 science.
Welcome Message
- The video is an introduction to a lesson about grade 9 science.
- The topic for today's lesson is species extinction and adaptation.
Definition of Terms
- Biodiversity refers to the variety of life in an area, including plants, bacteria, animals, and humans.
- Population in biodiversity refers to a group of organisms of the same species living in a certain place.
Diversity and Threatened Species
This section discusses diversity and threatened species.
Diversity Comparison
- Tuba Taharif with different kinds of aquatic species are more diverse than coconut plantation.
- Tuba Taharif has more population than coconut plantation being dominated by coconut trees.
Threatened Species
- Threatened species are those whose populations decline so fast that they become endangered such as Philippine eagle or monkey-eating eagle.
- When a species' population becomes so low that only a few remain, it is considered endangered like tamarao and torsion in the Philippines.
Extinct Animals
This section discusses extinct animals.
Extinct Animals in the Philippines
- Philippine rhinoceros and stagoden are considered extinct animals.
- Asian elephant, fossil miriam's, cebu tamara, tiger, and mayasen are extinct animals in the Philippines.
Causes of Extinction
This section discusses the causes of extinction.
Natural Causes
- Climate change is caused by a number of things that affect extinction such as severe weather conditions and changing chemical makeup of surroundings.
- Changes in sea levels or currents can displace water onto land that is already occupied, affecting marine life.
- Asteroids heat the earth with extreme force, potentially weakening a species gene pool in the future.
- Acid rain increases soil acidity which affects plant life and disturbs rivers and lakes.
Introduction
The video introduces the topic of extinction and invasive species.
Extinction and Invasive Species
- The video discusses eventual extinction.
- Invasive species invade foreign territory, use resources that other species depend on, and cause competition that can lead to the natural extinction of one of the species.
- Human causes of extinction include increased human population, destruction and fragmentation of habitat, pollution such as water and air pollution, climate change or global warming, habitat degradation, habitat loss and degradation affecting 85% of all threatened birds, 86% mammals and 88% threatened amphibians.
Climate Change
The video discusses how climate change affects ecosystems.
Effects of Climate Change
- According to John W. Williams' research findings, by the end of the 21st century large portions of the earth's surface may experience climates not found at present.
- Organisms in any ecosystem need a balanced environment where all living and non-living things are interacting harmoniously. If any part is disturbed other parts will also be affected.
Conclusion
The video concludes with music playing.
End of Video
- Music plays as the video ends.