The answer is <span>Immigration</span>
The right answer is smelly garbage.
Infestation is the penetration into the body of a parasite whose nature is not microbial.
smelly garbage is not synonymous of infestation, because the olfactory system only detected smelly metabolites of these microorganisms. This does not necessarily mean that the microorganism has managed to penetrate the body.
By cons other proposals are signs and tools for infestation (torn packaging with food leaking out, dead insect bodysuits, feathers, and fur).
Answer: It's C
Explanation: because They also do not have a brain, respiratory system, or circulatory system.
Photosynthesis is the correct answer, where plants release oxygen and humans use this to release carbon dioxide into plantes