You get back into your time machine with your wacky professor and take off again. as your time machine lands, you see an unusual landscape before you. as you open the door you realize you cannot breathe. you quickly shut the door, realizing you are in the
a. late precambrian
b. early mesozoic
c. early precambrian
d. late cenozoic

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

A74-year-old woman, who has been followed for the past 25 years for chronic obstructive pulmonary disease comes to the ed complaining of 48 hours of temperature to 38.6 c and worsening shortness of breath. she has a chronic productive cough, which has become more copious. on physical examination, she has rhonchi and increased fremitus in the posterior mid-lung field. a gram's stain reveals many epithelial cells and multiple gram-positive and gram-negative organisms; no neutrophils are seen. which of the following is the most likely organism causing the symptoms? - escherichia coli- haemophilus influenzae- klebsiella pneumoniae- mycobacterium tuberculosis- mycoplasma pneumoniae

How could yo improve public knowledge about obesity at your school