Before united states citizens travel to africa, a(n) for yellow fever is required.
immunity
immunization
viral detection
antibiotic

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

Si el equipo no fuera bueno no con el entrenador.

Which factor that affects biodiversity?