Characteristics of Life

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Characteristics of Life
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What makes a living thing alive?

• All living things are made of at least 1 cell.
• Unicellular 1 celled (ex. bacteria)
• Multicelled many cells (ex. humans)

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2) maintain homeostasis.

• a stable internal environment.
• EX People sweat when they need to cool their
  bodies.

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3) Have genetic material reproduce

• DNA is the genetic material.
• Asexual reproduction only one organism,
  offspring are exact replicas of the parent! (ex
  binary fission or cloning)
• Sexual Reproduction fertilization of egg cell
  by a sperm cell. Offspring will be a mixture of
  the parents.

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4) Have organization

• living things are organized at the molecular and
  cellular level.
• EX Humans have many types of systems, organs,
  tissues cells.

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5) Grow develop

• stages of life and cell division.
• EX embryo ? adult

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6) Need obtain energy (metabolism)

• no energy dead
• Organisms can obtain energy in 2 main ways
• 1) Autotrophs make their own food (ex plants
  algae)
• 2) Heterotrophs eat another organism (ex
  lions tigers bearsOH MY!)

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Living or Non-Living?
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Which characteristic is represented?
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Which characteristic is represented?
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Other things that living things may also do

• Respond to stimuli or environment
• Communicate
• Adaptations change over time (evolve)