Answer:
The egg .
Explanation:
two birds that weren't really chickens created the first egg
Answer:
True.
Explanation:
Readers generally like to look at the first few sentences in a paragraph to determine the subject of the paragraph. That's why it's best to put the topic sentence at the beginning of a paragraph. The vast majority of your paragraphs however, should have a topic sentence.
Based on the research that I did it seems that poison gas is the most factually proven one although I am not 100% sure.