Ring canals and radial canals are both a part of the (blank)
system
O
Circulatory
O
Water vascular
O
Muscular
O
Digestive

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

answerhypothesis;