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    Science 9, Lesson 4

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    raejewelingeniero
    this is about the biodiversity and evolution

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    Download as PDF, TXT or read online from Scribd

    Science 9, Lesson 4

    Uploaded by

    raejewelingeniero
    1 views3 pages
    this is about the biodiversity and evolution

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    Science 9, lesson 4

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    this is about the biodiversity and evolution

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    1 views3 pages

    Science 9, Lesson 4

    Uploaded by

    raejewelingeniero
    this is about the biodiversity and evolution

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    Biodiversity and Evolution

    Biodiversity
    - Is the term used to describe the number and variety of life found on Earth.

    a. Genetic diversity
    - pertains to the variation of genes within species.

    b. Species diversity
    - pertains to the variety and abundance of species within a region.

    c. Ecosystem diversity
    - is the variation among groups of organisms in different physical settings.
    - All parts of the ecosystem are interacting with one another. If one of its
    components experiences changes and does not adapt to its environment then it will
    most likely to die.
    Population
    - pertains to the number of organisms of the same species in the same region,
    Communities
    - are composed of different organisms in the same region.

    Biodiversity Index
    - is a scale of the diversity of plant and animal species in a given area. It is a widely
    used tool for estimating the complexity, stability and thus general health of an
    ecosystem

    Population of an organism can change and varies over time. This is due to the different
    limiting factors occurring in the situation. Limiting factors are usually described as lack
    of particular resources like the availability of food, water and space. Increasing the
    number of population size that an area can support is called carrying capacity. It is
    the size of a biological species that can be sustained in a specific environment, given all
    the available resources. When the number of species decreases in size, and only a few
    remain, that species is considered as endangered and possibly becomes extinct in the
    future.
    Biodiversity and Evolution
    Threatened Extinction
    - happens if the last member of that species is gone like dinosaurs.

    Natural causes of Extinction


    Climate Change
    - the sudden changes in the earth’s temperature.
    Land Development
    - conversion of land into residential area or building.
    Acid Precipitation
    - is a result of air pollution.
    Diseases/Epidemic
    - infectious diseases or virulent infectious diseases cause the change in biological
    populations.
    Meteoric Impact/Cosmic radiation
    - extinction happens when a massive asteroid or meteor hits the surface of the earth.
    The spread of Invasive species.
    - it can change the abundance of diversity or the food web in an ecosystem by
    destroying and replacing its natural value and number.

    Man-Made causes of SECIES Extinction


    Deforestation
    - illegal logging, kaingin farming
    Pollution
    - either air or water pollution.
    Destruction of Coastal Resources
    - this is caused by using dynamite in fishing, muro-ami, and the conversion of beaches
    into residences and overharvesting of fishes.
    Geologic Timescale
    - is a timetable of the earth’s history. In this scale, earth’s history is divided into major
    divisions called eras.
    Biodiversity and Evolution
    A. Paleozoic era (prehistoric life)
    - the existence of marine invertebrates; the development of marine life.
    B. Mesozoic era (middle life)
    - the existence of largest creatures.
    C. Cenozoic era (recent life)
    - the existence of warm-blooded animals and humans.

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