Which one of the following pollutants is responsible for the increase in skin cancer?

What does the number 18.9984 represent in the image?

1. isogamy 1 organisms with gametes of the same size and shape 2. anisogamy organisms with gametes of different sizes and shapes 3. oogamy 2 organisms with gametes of the same shape but different sizes 4. gonads gamete-producing organs in lower plants 5. gametangia gamete-producing organs in animals

What is the difference between magnification and resolution