Biology, 14.11.2019 09:31, jitosfc916
Alightweight 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 for testing this material?
a) use specialized equipment to measure how much uv light passes through stacks of one, five, or 20 layers of the material.
b) test the material in controlled natural settings by using natural uv light, and measure the uv light that passes through.
c) write a survey that asks people on beaches about their preferences for sunscreen and protective materials.
d) 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.
Answers: 2
Biology, 22.06.2019 02:00, haleylecompte
Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.
Answers: 3
Biology, 22.06.2019 15:30, kittycatwaffels
Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c. carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit
Answers: 1
Alightweight material is being tested for effectiveness in blocking ultraviolet (uv) rays from the s...
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