A. an open circulatory system
Explanation: In an open circulatory system, the blood is not enclosed in the blood vessels, but is pumped into a cavity called a hemocoel
Answer:
Chloroquine phosphate.
Explanation:
Chloroquine is the preferred treatment for any parasite that is sensitive to the drug. But in many parts of the world, the parasites that cause malaria are resistant to chloroquine, and the drug is no longer an effective treatmen
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Answer:
electron configuration is 2,8,8,2
Explanation:
1s2 2s2 2p6 3s2 3p6 4s2