Squirrels can sense when the weather is getting colder and they respond by gathering and storing food they can use during the colder months when food may not be readily available. in this scenario, gathering and storing the food is the a) impulse. b) stimulus. c) response. d) environmental condition.

I think its C Response

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.