Biology, 26.10.2019 07:43 emily41950
After 3 half lives how much of a radioactive substance will remain
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All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.
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Biology, 21.06.2019 23:00
The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?
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Biology, 21.06.2019 23:50
Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?
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Biology, 22.06.2019 05:30
2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.
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After 3 half lives how much of a radioactive substance will remain...
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