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a lichen is a symbiotic association between a fungus and green algae. the green algae carry out photosynthesis and provide the fungus with sugars. what does the fungus provide the green algae in return?

a. an energy source
b. sugars from photosynthesis
c. water and minerals
d. nutrients and oxygen

The response is the basis for vaccination. primary secondary tertiary none of the above

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Recently, crops of vegetables such as lettuce and green onions have been contaminated, while they are still on the farm, with bacteria that cause food poisoning. how will science influence the way the government responds to prevent an increase in food-borne diseases? because science has shown that lettuce and green onions are not nutritionally valuable, the government may pass laws that ban the sale of lettuce and green onions. because science has shown that there is no way to prevent bacterial contamination, the government may pass laws that punish businesses that buy lettuce and green onions. because science has shown that the washing of hands prevent the spread of infectious diseases among people, the government may pass laws that require hand washing by everyone who handles food. because science has shown there are ways to find the source of the contamination, the government may pass laws that require farm practices that reduce the contamination of lettuce and green onions.