Why are the accidentally introduced zebra mussels referred to invasive species

Apatient has an open displaced fracture of the second cervical vertebra. this is her fifth visit and the fracture is healing normally. what icd-10-cm code is reported?

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.