Bronchi branch continually into smaller and smaller tubes and eventually end in sacs called
a. trachea
b. motor neurons
c. oblongata
d. alveoli

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

Explain in your own words what caused pangea to separate and why we don't worry about earthquakes in florida.

What astronomers thought epicycles were correct?