Define the terms infection , pathogen , incubation period and allergy .
For infection, please refer the following link:-
https://www.meritnation.com/ask-answer/question/what-is-infection/why-do-we-fall-ill/3965627
For pathogen, please refer the following link:-
https://www.meritnation.com/ask-answer/question/what-are-pathogens-in-detail-from-lance/microorganisms-friend-and-foe/1059793
For incubation period, please refer the following link:-
https://www.meritnation.com/ask-answer/question/what-is-incubation-period/why-do-we-fall-ill/1809098
For allergy, please refer the following link:-
https://www.meritnation.com/ask-answer/question/what-is-an-allergy/communicable-diseases/2362394
https://www.meritnation.com/ask-answer/question/what-is-infection/why-do-we-fall-ill/3965627
For pathogen, please refer the following link:-
https://www.meritnation.com/ask-answer/question/what-are-pathogens-in-detail-from-lance/microorganisms-friend-and-foe/1059793
For incubation period, please refer the following link:-
https://www.meritnation.com/ask-answer/question/what-is-incubation-period/why-do-we-fall-ill/1809098
For allergy, please refer the following link:-
https://www.meritnation.com/ask-answer/question/what-is-an-allergy/communicable-diseases/2362394