The World of Biology

1
The World of Biology

• Section 1.2

2
Characteristics of Life

• All living things are composed of cells
• Some cells are specialized to perform specific
  functions

3
Types of Cells

• Animals muscle cells, blood cells, brain cells,
  skin cells

4
Plant cells

• stone cells, parenchyma cells, xylem, phloem

5
Cell Organization

• Cells structures are organized by their functions

6
Energy Use

• All living things require energy to maintain
  cellular functions
• energy is used during metabolism
• Metabolism the sum of all the chemical processes

7
Homeostasis (stable internal conditions)

• Cells maintain their water content by taking in
  or releasing small amounts
• A cell that takes in too much water will rupture

8
Growth

• All living things grow by cellular division
• Cellular division the formation of two cells
  from an existing cell

9
Development

• The process by which an adult organism arises
• Produced by repeated cell divisions and cell
  differentiation

10
Reproduction

• Reproduction is NOT essential to the survival of
  an individual
• However, it is essential for the continuation of
  a species

11
The Living World

• Biodiversity ALL of the living organisms on
  Earth
• Insects are the most abundant
• Many more organisms havent been discovered yet,
  especially in rainforests