*Question*
Answer the following question given this paragraph: Acid rain is rain that has a pH less than 5 ( Figure below ). Acidity is measured on the pH scale . Lower numbers are more acidic, and higher numbers are less acidic (also called more alkaline ). An acid has a pH of less than 7. The pH of normal rain is 5.6. It's slightly acidic because carbon dioxide in the air dissolves in rain. This forms carbonic acid, a weak acid. Q: What is the term for rain consisting of water with a ph below 5? Choices: - carbon rain - produce rain - Hot Rain - acid rain A:
**Answer**
acid rain

*Question*
Answer the following question given this paragraph: This scene is from Anza-Borrago California Desert Park. However, deserts exist around the globe. You might find a similar picture of a desert in Africa. The desert is one type of biome. Q: A desert is a type of what community in an ecosystem? Choices: - culture - population - colony - biome A:
**Answer**
biome

*Question*
Answer the following question given this paragraph: Figure 17.5 Viruses can be complex in shape or relatively simple. This figure shows three relatively complex virions: the bacteriophage T4, with its DNA-containing head group and tail fibers that attach to host cells; adenovirus, which uses spikes from its capsid to bind to the host cells; and HIV, which uses glycoproteins embedded in its envelope to do so. Notice that HIV has proteins called matrix proteins, internal to the envelope, which help stabilize virion shape. HIV is a retrovirus, which means it reverse transcribes its RNA genome into DNA, which is then spliced into the host's DNA. (credit "bacteriophage, adenovirus": modification of work by NCBI, NIH; credit "HIV retrovirus": modification of work by NIAID, NIH). Q: Hiv is a retrovirus, which means it reverse transcribes its rna genome into what? Choices: - atp - ribosomes - amino acid chains - dna A:
**Answer**
dna

*Question*
Answer the following question given this paragraph: Water treatment is a series of processes that remove unwanted substances from water. More processes are needed to purify water for drinking than for other uses. Q: What does water treatment do to water? Choices: - increases volume - restores bacteria - adds flavor - removes unwanted substances A:
**Answer**
removes unwanted substances