First scientist was Carl Linnaeus
C. Medusa. Everything else on the list is a part of another creature, medusa is the only cnidarian here!
Answer:
rise over run
Explanation:
rise refers to the number of units going u or down a graph
run refers to the number of units going left or right
it is seen as so;
,
, or 
Don't panic when I included "delta". Delta, it refers/means the small mathematical triangle found beside the rise and run symbols of y and x
It's either A. or C. because since its near the equator it's not going to be dry.
You're correct because when birds hit their max altitude it's harder to breathe and to minimize the time of there flight they store immense amounts of oxygen in their lungs.