1. ¿Cuál es el objetivo principal de la técnica de PCR o polimeric chain reactión o reacción en cadena de la polimerasa?

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this

the supermassive black hole is in the middle of the galaxy.