In a test cross, what must you cross an animal showing the dominant trait in order to learn it's genotype

answer; i believe that the correct answer is (light);

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

not only is it colder, it also becomes darker, less salty, and more dense.