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

The correct answer cyanobacteria

Explanation:

The Cyanobacteria or blue green algae are the potent nitrogen fixers as they convert nitrogen gas into ammonia. Other options like Daphnia and Bosmina are water fleas that cannot fix nitrogen and trouts are the fishes that don't fix nitrogen. Hence, the correct option is,

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.