Biology is the Study of Li f e  What is life?. 1-3 Studying Life  A. Alive or dead ?  Tree alive?  Desk alive?  Cut flower alive?  Is fire alive???

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Presentation transcript:

Biology is the Study of Li f e  What is life?

1-3 Studying Life  A. Alive or dead ?  Tree alive?  Desk alive?  Cut flower alive?  Is fire alive???

Characteristics of all living things  Living things are made up of units called cells.

Living Things Reproduce

Living things are based on a universal genetic code

Living things grow and develop

Living things obtain and use materials and energy- METABOLISM

Living things respond to their environment- RESPONSIVENESS  QKSf0LmY QKSf0LmY

Living things maintain a stable internal condition- HOMEOSTASIS

As a group, living things change over time- EVOLUTION

Spontaneous Generation  AKA Life from nothing  In 1600s, this was a “hypothesis” for the appearance of living things  om/watch?v=opscES4 eHVU om/watch?v=opscES4 eHVU

Francesco Redi 1668  Observed flies on meat  New Hypothesis  Maggots came from flies!  First use of controlled experiment

Needham & Spallanzi’s Experiments

Pasteur finally proved spontanous generation wrong.

Scientific Theory  A tested & supported hypothesis that merges many observations  Natural selection is a theory.  Big Bang is a theory.  gk gk  NOT A FACT  Scientific Theory is Changable.

Scientific Law  is a FACT based on repeated observations  law of gravity  energy can neither be created nor destroyed  Gas laws

Biology is studied at different levels of organization  Molecular

Cellular Level

Groups of Cells  Tissues  Organs  Organ systems

Organism

Population Group of the same type of organisms living in the same area at the same time

Community Different populations living in the same area

Ecosystem Communities and the non-living surroundings Biotic- Living Factors Abiotic- Non-living Factors

Biosphere All of the ecosystems on Earth

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