music: 70's Chart Toppers: Name The Artist: Let Your Love Flow?

Questions

hay fever is the ---------- most prevalent chronic condition in the united states?

heroin is derived from the ---------- poppy, papaver somniferum, which means the poppy that brings sleep?

heroin is the brand name of ---------- once marketed by bayer?

humans are the only primates that do not have ---------- in the palms of their hands?

if you go blind in one eye you only lose about one ---------- of your vision, but all your sense of depth?