<span>Steel that is strong but cheap could be used for bridges and skyscrapers because for something needed to be so dependable,it would of had to go through extensive quality control. And the steel producer would have to prove it can hold up and explain why it's cheap.</span>
Correct answer is B.
Move into the cell. and cell became enlarge
A frog's lungs don't work that well, but since it's skin is so thin, oxygen and carbon dioxide can pass trough it.