Pigments absorb light used in photosynthesis.Set of wavelengths that a pigment doesn't absorb are reflected.
The population that was not affected was clams.
What were the people drinking?
The possible benefits of genetic engineering include:
More nutritious food.
Tastier food.
Disease- and drought-resistant plants that require fewer environmental resources (such as water and fertilizer)
Less use of pesticides.
Increased supply of food with reduced cost and longer shelf life.
Faster growing plants and animals.