13. What is the result of an endothermic chemical reaction? (5 Points)
O hydrogen bonds are broken down
O products have lower bond energy than reactants
more energy absorbed than released
no energy absorbed or released
W
14

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.

blue

light-years

magnitude

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).