Notes for 9/5/07
Living or Non-living
How do we know if something is living or non-living?
Living things must have ALL 6 characteristics.
The 6 characteristics of living things are:
Notes for 9/7/07
Cells
Robert Hooke first observed cork cells through a microscope in 1665.
Over time we learned more about cells.
We call cells “The Building Blocks of Life.”
All living things are made of cells.
Some living organisms, like bacteria, only have one cell.
Organisms with many cells usually have many different kinds of cells.
Humans are made up of trillions of cells.
Cells work together to keep the organism alive.
Cells must get food and water to keep the organism alive.
Cells get food and water by a process called diffusion.
Diffusion is when something moves from where there is a lot of it to where there is not much of it.
Cells have a thin covering called a cell membrane.
The nucleus is the brain of the cell.
Vacuoles store food, water, and waste materials.
Source: Harcourt Science 2000, pp A6-A11