A lightweight material is being tested for effectiveness in blocking ultraviolet (UV) rays from the Sun that cause skin to burn and possibly develop skin cancer. Which method would be most helpful for testing this material? Use specialized equipment to measure how much UV light passes through stacks of one, five, or 20 layers of the material. Test the material in controlled natural settings by using natural UV light, and measure the UV light that passes through. Write a survey that asks people on beaches about their preferences for sunscreen and protective materials. Test the material in a lab setting by using humans and a variety of UV light sources, and develop a scale to measure the damage that is caused to human skin.

For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?

Which blood cell spend most of their time in the lymphatic system?

Explain why autonomous underwater explorers (aue) will provide entirely new kinds of information about ocean processes