Ques:Q: Contributing to the blood-brain barrier is one of the jobs of glial cells, which support neurons in what system? Choices: - peripheral nervous system - circulatory system - digestive system - central nervous system A:

Ans:central nervous system
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Ques:Q: What are the nonliving aspects of the environment called? Choices: - metastatic factors - nucleic factors - antibiotic factors - abiotic factors A:

Ans:abiotic factors
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Ques:Q: The dna is wound around proteins called what? Choices: - leptons - nucleotides - pepsins - histones A:

Ans:histones
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Ques:Q: What serves as a first responder to pathogenic threats that bypass natural physical and chemical barriers of the body? Choices: - cells immune system - super immune system - immense immune system - innate immune system A:

Ans:
innate immune system
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