*Question*
You are presented with the question "what have a negative impact on water quality?" and the following answer choices: - CFCs - oxygen - hydrogen - oil - h2o - mines - fungi - Cars Now knowing that acid rain has a negative impact on water quality and acid rain is partly caused by CFCs, choose the best answer.
**Answer**
CFCs

*Question*
You are presented with the question "leaves turn brown in which season?" and the following answer choices: - july - winter - mild - summer - dormant - spring - break off - rainy Now knowing that adrought can change the color of an environment from green to brown and leaves fall off during drought or cold conditions, choose the best answer.
**Answer**
winter

*Question*
You are presented with the question "what have motility?" and the following answer choices: - insects - gravity - animals - fungi - mass - amoebae - parasites - density Now knowing that most protists have motility and protists are single-celled microscopic organisms like amoebae, choose the best answer.
**Answer**
amoebae

*Question*
You are presented with the question "What can be a source of food for many species of fish?" and the following answer choices: - Fully cooking the oysters - Organic compounds - beef - fishing poles - sessile organisms - barnacles - grass - gastropod shells Now knowing that sponges are a source of food for many species of fish and most sponges are sessile, choose the best answer.
**Answer**
sessile organisms