Which of the following statements is true? Multiple Choice An undercooked hamburger patty is the most likely source of giardia. In the United States, people rarely suffer from food-borne illnesses. A food's odor or appearance is not a reliable indicator of whether it's safe to eat. The United States Environmental Protection Agency is responsible for inspecting local restaurants and grocery stores to ensure they meet food safety standards.

Giardiasis is an intestinal illness caused by infection with the parasite Giardia lamblia, which lives in contaminated water. Although the illness most often occurs in developing countries, giardiasis is also a common cause of waterborne illness in the United States. A person can remain infected with Giardia until the infection is diagnosed and treated. In developing areas of the world, it is common for more than 20% of a country's population to have ongoing Giardia infection. In the United States, only 1 or 2 out of every 10,000 people have Giardia in a typical year, but the infection is found in about 1 out of 3 people who have prolonged diarrhea symptoms if they have recently traveled to a developing country.

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dbg

explanation:

violet light has a shorter wavelength than blue light. violet light is scattered more than blue light. however, the human eye is less sensitive to violet than to blue. as a result, we perceive a blue sky instead of a violet sky.