Hurry !
concept maps work because they
a.
are colorful and interesting
b.
can be drawn by almost anyone
c.
visually demonstrate relationships
d.
leave out vital information

what types of rivers

1) the stages a new product goes through from beginning to end, i.e., the stages that a product passes through from introduction through growth, maturity, and decline. 2) the time from initial research and development to the time at which sales and support of the product to customers are withdrawn. 3) the period of time during which a product can be produced and marketed profitably.

                                          hope it

answer; niosh, the national institute for occupational safety and health;