I think it's D. primary source.... not 100% sure
The indians from the mission cut the grains, separated it in sheath and placed it behind gramas house
1. C. The paragraph gives a brief overview of mad cow disease.2. It's a site where anyone can modify the content. The wiki part of the address tells you this is true.3. The evidence supporting a claim about the benefits of water conservation. 4. Scientific American- it's a scholarly periodical.5. how to set up the yards... The last sentence in the passage introduces this part.6. evidence about the number of people killed during the Spanish flu pandemic.7. .com is the most unreliable as it's the least regulated.8. a fact about the drought9. Today's farm machines can milk more than 100 cows an hour. This fits best because it follows a sentence stating the the milking process is superior. This fact makes that seem true.
They can help illustrate meaning for the reader.
