'In a human being, each cell has about 25,000 of these basic units of heredity'
genes
SCIENCE CLASS: In a human being, each cell has about 25,000 of these basic units of heredity
In a human being, each cell has about 25,000 of these basic units of heredity
In a human being, each cell has about 25,000 of these basic units of heredity
SCIENCE CLASS
genes
SCIENCE CLASS