<span> D.They reproduce sexually and have many traits that are easy to observe.
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The vena cava pumps blood from the heart to the rest of the body. false
Answer:
7. Adenine (A), nitrogenous bases
8. cytosine
9. nucleotides
10. purine
11. double helix
12. genetic material
13. single-ring
14. double-ring
15. nucleic acids
16. chromosome
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Answer:
A factors or conditions within an experiment that is kept the same is called the=Control variable
