*Question*
Acid rain has a negative impact on water quality, and acid rain is partly caused by CFCs. Given these facts, what have a negative impact on water quality among the following options: - CFCs - oxygen - hydrogen - oil - h2o - mines - fungi - Cars
**Answer**
CFCs

*Question*
Adrought can change the color of an environment from green to brown, and leaves fall off during drought or cold conditions. Given these facts, leaves turn brown in which season among the following options: - july - winter - mild - summer - dormant - spring - break off - rainy
**Answer**
winter

*Question*
Most protists have motility, and protists are single-celled microscopic organisms like amoebae. Given these facts, what have motility among the following options: - insects - gravity - animals - fungi - mass - amoebae - parasites - density
**Answer**
amoebae

*Question*
Sponges are a source of food for many species of fish, and most sponges are sessile. Given these facts, what can be a source of food for many species of fish among the following options: - Fully cooking the oysters - Organic compounds - beef - fishing poles - sessile organisms - barnacles - grass - gastropod shells
**Answer**
sessile organisms