I did some research on this question it seem to be 13 species. I hope this help a little.
Look it up online it should tell you
Sorry, I'm not sure.
I would suggest asking a trusted adult or teacher or redoing the lesson. Cheating isn't a good path: you will not do well in the future if you always search for answers on the internet.
At one point, the value of the United States dollar was set according to the gold standard. One of these examples is the fixed exchange rate. The gold exchange standard guarantees the fixed exchange rate to the currency of another country that uses the gold standard.
The answer would be letter A.
