Answer:
The author provides background information so that the reader knows what caused the death of the well-known Lieutenant
Colonel Custer
Explanation:
C and B. A past tense refers to the past. Crawls is currently doing, was crawling could be either present or past, so if you have a multiple choice that would be one of them. C is crawled, meaning he was. And D is will crawl, meaning the future.
Answer:
model c has the best molecular structure. Undefined model A.
Explanation:
This is because model b doesn't have molecules.