They're the only vein that carries oygenated blood
Answer:
Microtubules
Explanation:
These filament-like structures are a major component of the cytoskeleton of the cell and help is maintain asymmetrical cell shape. They are composed of tubulin molecules arranged to form a 'hollow straw' attached to the cell membrane end to end . The contraction and lengthening of these microtubules are controlled by the addition of removal these of tubulin molecules to vary its length.
Regulating pollutant discharges into the waters of the United States
Answer:G. thurberi
Explanation: because you can really tell. Correct