Which measure would be MOST effective in increasing the human population's immunity against contagious diseases? A. Getting vaccinated against contagious diseases
B. Treating the first person infected with the contagious disease
C. Isolating the first person infected with the contagious disease
D. Distributing antibiotics in the community to avoid the contagious disease

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.

b - the respond is innate and varies over time.

good luck!