Translation:These eggs are not fresh.
Reporting errors does nothing; duolingo just ignores reports. Commenting here at least feels like you've done something because you can see others having the same problem.
Not true. Sometimes you will get an email saying that an answer you suggested is now accepted.
Dulingo does read reports and add more accepted answers with time.
It may sound unnatural but we are trying to aim for accuracy. There are duck eggs, quail eggs and many other edible supermarket eggs so duolingo should accept it as we're trying to go for accurate rather than vague answers
In the Quest for accuracy, let's not forget consistency. The word "very" was marked incorrect, but allowed in other excersizes: "These eggs are not very fresh"