"explain the difference between risky and riskless arbitrage."

Risk arbitrage also called merger arbitrage trading; it refers to an event mediated hypothetical trading method. It tries to produce profits by taking a long position in the stock of a target company, and optionally merging it with a brief position in stock of an attaining company to produce a verge.

Riskless arbitrage includes taking merit of interest rate differentials by involving in a spot transaction today to sell/buy foreign currency, and at the same time involving in a purchase/sale of foreign currency for a particular time in the future.

fabric is silk wool ext. paper isnt

explanation:

u cant make fabric out of paper cause paper comes from wood while fabric comes from animals

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.