What is the only guaranteed way to avoid pregnancy?

Which blood cell spend most of their time in the lymphatic system?

Si el equipo no fuera bueno no con el entrenador.

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters