I would say energy myself, and this is because energy plays a key role in all of these. With trophic levels energy is being transferred amongst the levels. Food chain's is a map of how the energy is passed along the chain. Food web is a web of how energy is transferred, and this is why I would say energy is a keyword.
Answer:
2, 6 are the one you should select
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Answer:
A. They contain a single circular DNA molecule.
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Answer:
3.
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3. Exposed many people to a weakened form of the measles virus, making them immune.
vaccines are weaker versions of the sickness so it's 3
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About 26 percent of adult stranded sea lions that die are diagnosed with cancer. Which is high for the population of wild animals. The research finding shows that death of a sea lion with cancer is invaluable. The research shows that sea lion pulp are expose to PCBs while in utero. This is a important health effects in the later life of sea lions,because PCBs can affect organ development.
During the research the Center collects samples from each of these patients to measure environmental exposure to carcinogens,it was discovered that most sea lions were infected with a herpesvirus similar one that causes Kaposi's sarcoma in humans.