A solution that is a 4 on the pH scale is an acid, about the acidity of tomato juice.
Biodiversity hotspot
A biodiversity hotspot is a biogeographic region with significant levels of biodiversity that is threatened with humans. Norman Myers wrote about the concept in two articles in “The Environmentalist” (1988), and 1990 revised after thorough analysis by Myers and others “Hotspots: Earth’s Biologically Richest and Most Endangered Terrestrial Ecoregions” and a paper published in the journal Nature
The statement "The American Psychological Association is the only organization that can approve psychological research studies." is false.
Sensory receptors is the answer I found
