Cell Size and Scale
5 The Living Environment
For Grades: 6-8
Learning Goal 1a
All living things are composed of cells, from just one to many millions, whose details usually are visible only through a microscope.
Learning Goal 1b
Different body tissues and organs are made up of different kinds of cells.
Learning Goal 1c
The cells in similar tissues and organs in other animals are similar to those in human beings but differ somewhat from cells found in plants.
Learning Goal 2a
Cells repeatedly divide to make more cells for growth and repair.
Learning Goal 2b
Various organs and tissues function to serve the needs of all cells for food, air, and waste removal.
Learning Goal 3a
Within cells, many of the basic functions of organisms—such as extracting energy from food and getting rid of waste—are carried out.
Learning Goal 3b
The way in which cells function is similar in all living organisms.
Learning Goal 4
About two thirds of the weight of cells is accounted for by water, which gives cells many of their properties.