Problem: Text: Water stagnation occurs when water stops flowing. Stagnant water can be a major environmental hazard.

Question: is it safe to swim in stagnant water?

OPTIONS:
- no
- yes
A: no

Problem: Text: Africanized bees have spread across the southern United States, where they pose a slight danger to humans (making beekeeping--particularly hobby beekeeping--difficult). As an invasive species, feral honey bees have become a significant environmental problem in non-native areas. Imported bees may displace native bees and birds, and may also promote the reproduction of invasive plants ignored by native pollinators. Unlike native bees, they do not properly extract or transfer pollen from plants with pore anthers (anthers which only release pollen through tiny apical pores); this requires buzz pollination, a behavior rarely exhibited by honey bees. Honey bees reduce fruiting in Melastoma affine, a plant with pore anthers, by robbing its stigmas of previously deposited pollen.

Question: are honey bees an invasive species in america?

OPTIONS:
- no
- yes
A: yes

Problem: Text: Salt water chlorination is a process that uses dissolved salt (2,500--6,000 ppm) as a store for the chlorination system. The chlorine generator (also known as salt cell, salt generator, salt chlorinator or SWG) uses electrolysis in the presence of dissolved salt (NaCl) to produce hypochlorous acid (HClO) and sodium hypochlorite (NaClO), which are the sanitizing agents already commonly used in swimming pools. As such, a saltwater pool is not actually chlorine-free; it simply utilizes added salt and a chlorine generator instead of direct addition of chlorine.

Question: can you use chlorine in a saltwater pool?

OPTIONS:
- no
- yes
A:
yes