These systems work together to fight foreign invaders that may cause infection or disease

I don't know if this is the correct answer but i think it is Immune System

This is the is the question on EDGE:

The integumentary system and the immune system

The lymphatic system and the integumentary system

The immune system and the lymphatic system

all of the above systems

The correct answer is all of the above systems. Or D.

Explanation:

EDGE 2021

konichiwa~! my name is zalgo and i am here to you out on this amazing day. i have been through break-ups before, and they are not easy. each one seems to get a bit harder yet easier. the best thing to do is do the things you enjoy doing the most before you had got in t he relationship. maybe even try and find new and more exciting things to do that will take your mind off of it. and it is no surprise you seem to have a fear to talk to anyone, most people do, it's called "anxiety". most people overcome and conquer their anxiety. just try talking to someone on a video game or go out to a coffee shop and try starting a conversation with a person. that will definitely !

i hope this ! : 3

"stay and stay proud! " - zalgo

the answer is d its the most logical and accurate out of them all : )