human blood consist of blood groups a, B, and oh. However, there is one more blood group, AB, which contains alleles A and B in the same genotype. what is the phenomenon called

Codominance

Explanation:

Codominance means that neither allele can mask the expression of the other allele. An example in humans would be the AB blood group, where alleles A and alleles B are both expressed.

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.

layer 3 is younger than layer 6.