Characteristics of Life 1) made of cells 2) reproduce 3) DNA 4) grow and develop 5) obtain materials for energy 6) respond to environment 7) stable internal environment 8) evolve

Unicellular and multi-cellular

CELLS

Cells

Chapter 1 What is Life? Reproduce Asexual reproduction - involves a single parent; offspring are genetically identical to the parent. Sexual reproduction - involves 2 parents; offspring are genetically diverse. – DNA from both parents

DNA –deoxyribonucleic acid

DNA is the genetic code that instructs the cells what to do DNA is the genetic code that instructs the cells what to do. Also give inheritance

grow

Differentiation is when cell change into different cells that perform other functions

Develop means to change

Plants get ENERGY by photosynthesis

Animals get ENERGY by eating other organisms

Decomposers (bacteria and fungi) get Energy by feeding on dead plants and animals

Respond to environment Trees loose leaves in the fall

Maintain internal stable environment Called homeostasis EXAMPLE– HUMAN BODY TEMPERATURE WHEN YOU GET HOT --- SWEATING WHEN YOU GET COLD -- SHIVERING

EVOLVE TO CHANGE OVER TIME Life is always changing….. On the level of DNA…… Change = Evolution