This puzzle features six foreign words --- perhaps in keeping with the friendly theme.
I do not believe these words are, as AYER is, inappropriate because they are actually found in English prose, poetry, and names.
I liked "Chain letters?"
for DNA but not so much "Changes, in a Darwinian sense" for ADAPTS. While the entry is not incorrect, adaptation was a Lamarckian concept published 50 years before Darwin published a word. As gentlemanly as Darwin was, he would have pointed that out himself.