Three or more forms of a gene that code for a single trait are called

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Identify the examples in which sam interacts only with natural resources

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.