The diphtheria exotoxin is an a-b toxin that view available hint(s) the diphtheria exotoxin is an a-b toxin that causes host cell lysis is encoded for by genes in the chromosome of corynebacterium diphtheriae cells is found in all corynebacterium diphtheriae cells is found only in corynebacterium diphtheriae cells that have been infected with lysogenic bacteriophage β

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.

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.