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Earth and Life Science: From Cosmic Origins to Cellular Systems

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This document is an extensive academic reviewer designed for Grade 11 students, primarily covering the foundational principles of Earth and Life Science. It begins by exploring the symbolic and mythological origins of life from various cultural perspectives—such as Egyptian, Mesopotamian, and Filipino traditions—before transitioning into scientific theories regarding the beginning of time and the universe. The text meticulously details the structure of the solar system, differentiating between terrestrial and Jovian planets, and explains the life cycle of stars and the chemical evolution of elements through nuclear fusion. Beyond cosmology, the reviewer provides an in-depth look at Earth’s interconnected subsystems—the geosphere, hydrosphere, atmosphere, and biosphere—and how they facilitate essential biogeochemical cycles like the water, nitrogen, phosphorus, and sulfur cycles. It also addresses practical environmental concerns, including human impacts such as fossil fuel combustion, deforestation, and the resulting global consequences like climate change and acid rain. The comprehensive nature of the content makes it an ideal resource for mastering both the theoretical origins of the cosmos and the complex biological and geological processes that sustain life on Earth today.

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TOPIC 1: Beginnings of Life: Myths and Sacred Origins

Symbolic Beginnings of Life

1.​ From the Waters
-​ Life emerges from primordial waters or oceans.
-​ Examples:​
Egypt: Nun → primeval waters.​
Mesopotamia: Apsu (freshwater) + Tiamat (saltwater) → first gods.​
Philippines: Sea goddess & sky god → world formed.​

2.​ From Sky and Earth
-​ Life begins when sky and earth are separated.
-​ Examples:​
Māori: Rangi (Sky Father) & Papa (Earth Mother) separated by children → light
& life.​
Philippines: Bathala creates life after defeating rivals.​

3.​ From the Body of a Giant or God
-​ Life/world formed from divine being’s body.
-​ Examples:​
Norse: Ymir’s body → earth, sky, seas.​
China: Pangu’s body → mountains, rivers, stars.​

4.​ From Clay or Dust
-​ Humans shaped from earth/clay.\
-​ Examples:​
Greek: Prometheus molds humans from clay.​
Yoruba (Nigeria): Obatala forms humans; Olodumare breathes life.​
Philippines: Bathala creates first humans from bamboo.​




Beginning of Time

-​ Time is often linked with creation, not measured in years.​

1.​ Before Time Existed
-​ Primordial void, darkness, nothingness.
-​ Examples:​
Greek: Chaos → Gaia, Tartarus, Eros.​
Egypt: Nun → Atum creates light & land.​
Philippines: Sky (Bathala) + sea (Aman Sinaya) → creation.​

-​
2.​ Cyclical Time
-​ Time is a cycle of birth, destruction, and rebirth.

, -​ Examples:​
Hinduism: Kalpas; creation-sustaining-destruction cycles.​
Maya: Baktuns; fifth world.​
Norse: Fire & ice → Ragnarök → renewal.​

3.​ Dawn of Light
-​ Time begins with the first appearance of light.​


Pre-Civilization Beliefs

1.​ Animism - Spirits in animals, rivers, trees, rocks​

2.​ Earth-Diver Myths - Creature/divine being retrieves mud → land​

3.​ Emergence Myths - Life from underground/caves​

4.​ Dreamtime (Australian, Aboriginal) - Spirits shape land & life through song/dance




Religion Creation Interpretation


Christianity God created in 6 days & rested on 7th Life is sacred; humans are stewards
(Sabbath); Adam & Eve


Islam Allah forms Adam from clay Unity under one God; life is sacred


Hinduism Cyclical universe (Brahma, Vishnu, Life from Brahman; cosmic order
Shiva)


Buddhism Dependent origination & rebirth No single creation; focus on liberation


Judaism God creates humans in His image Life is sacred; ethical responsibility


Taoism Life arises from Tao Self-generating; harmony with nature


Sikhism Divine will (hukam) All life from one divine essence


Shinto Kami shape land & life Creation linked to nature & spirits

, TOPIC 2: Origin of Life


Theory Explains Limitations Evidence

Abiogenesis Organic molecules from How non-living → Miller-Urey, Fox
inorganic compounds self-replicating cells microspheres

Hydrothermal Stable, energy-rich Molecules surviving Extremophiles, lab
Vent environment for early extreme conditions simulations
chemistry

Panspermia How life arrived on Earth Original origin unknown Meteorites, interstellar
from space compounds

RNA World Molecular bridge from Formation of first RNA Ribozymes, lab RNA
chemistry → first cells strands replication


Summary:

-​ Abiogenesis - Life from non-living matter (chemical evolution).​

-​ Hydrothermal Vent - Life in deep-sea vents (energy + minerals).​

-​ Panspermia -Life came from space (meteorites/comets).​

-​ RNA World - RNA molecules started life → DNA + proteins → cells.



TOPIC 3: Characteristics of Life

Biology - Study of living things and their processes.

-​ Explores morphology, physiology, anatomy, behavior, origin, and distribution.
-​ from cells → ecosystems.
-​ Aristotle’s observations; term “biology” = bios (life) + logos (study).

Key processes of life:

1.​ Metabolism - Use energy for survival
2.​ Homeostasis - Maintain internal stability
3.​ Growth & Development - Increase in size or complexity
4.​ Reproduction - Create offspring
5.​ Response to Stimuli - React to environment
6.​ Adaptation & Evolution - Change over generations to survive.

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Geüpload op
7 februari 2026
Aantal pagina's
22
Geschreven in
2025/2026
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College aantekeningen
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