Which type of organism in this lab can get its nitrogen from nitrogen fixation (converting n2 gas into ammonia), allowing it to grow even if easily used forms of nitrogen are not available in its water or food?
cyanobacteria
daphnia
bosmina
trout

Witch layer of the atmosphere has the most air pressure

Which characteristics are true of the arabian desert? multiple answers choose all answers that are correct. a. is mostly below sea level b. covers almost the entire arabian peninsula c. contains the largest sand sea in the world d. has very few people living there

How many inches of snow did any of you guys get last night?