What detail from Gilgamesh: A new English version best illustrates a challenging journey?

You are reading an informational text for english class, and you find a lot of words you don't know. your teacher says you don't need to look up all of them in the dictionary, only the ones you need to get the main point of the text. how could text features you figure out which words to look up?

Write about a scientist and present information including a short biography, contribution,their scientific achievements and contribution to science

When mrs. jameson says "it (the desert) won't leave you cold," what does she mean?