Photovoltaics is a technology from which energy source?

To be or not to be that is da question

Draw the farm's ppf for corn and beef. draw a point that shows an inefficient combination of corn and beef. label ita. draw a point that shows an unattainable combination of corn and beef. label itb. draw a point that shows an efficient combination of corn and beef. label itc.

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?