The American Heritage® Student Science Dictionary
by Editors of The American Heritage® Dictionaries
More than 4,500 entry words with clear, easy-to-understand definitions
More than 425 full-color photographs and drawings
175 Feature Notes on important scientific concepts, the major discoveries of many scientists, and the usage and history of scientific terminology
Detailed graphic treatment of selected subjects, such as the structure of atoms, photosynthesis, plate tectonics, and the life of stars
Handy tables and charts, including the periodic table of the elements, a chart of geologic time, and a timeline of advances in computing
The American Heritage® Student Science Dictionary is the ideal resource for homework assignments, school projects, or just browsing. This book is the key to unlocking the language of science and the natural world for students and their families.
mutation (my-t'shn) A change in the genes or chromosomes of an organism. Mutations occurring in the reproductive cells, such as an egg or sperm, can be passed from one generation to the next. Most mutations have harmful effects, but some can increase an organism's ability to survive. A mutation that benefits a species may evolve by means of natural selection into a trait shared by all members.