I use this site and it's a complete lifesaver!
https://www.learnthat.org/pages/view/roots.html
Answer:
The researchers discovered a negative relationship between mobile phone usage and students' academic performance, such that every 100 minutes that a student spent using their phone a day lead to the student dropping 6.3 places in terms of their academic school ranking.
One theme from Rikki Tikki Tavi would be courage. Rikki has to fight<span> two cobras, Nag and Nagaina, to protect his garden and Teddy. He is frightened of them because they are stronger and bigger than he is, but he overcomes his fear and fights them anyway.</span>
The vES ending should be added to nouns that end in -f or -fe in their singular form. In that case, the -f or -fe is removed and -ves is added as a plural ending. Examples include: life - lives, wife - wives, knife - knives, wolf - wolves, leaf - leaves. But there are also exceptions, such as belief - beliefs, cliff - cliffs, roof - roofs.
