What is a disadvantage to hydropower dams? a. not every place is close to the ocean. b. people and animals can lose their homes to flooding. c. not every place receives many hours of direct sunlight. d. many pollutants are put into the air.

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.