What is another name for the dorsal surface of a starfish

Which would be an adaptation in a rainforest, but not in a tundra? a. ability to store water for a long time b. fur that blends in with snow c. strong claws for killing prey d. a beak that can dig into thick trees

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

If assuming tasting ptc as a simple gene trait, what other genotype would you select to put in this missing genotype box that could result in this phenotype