The movement of food from the stomach into the esophagus is usually prevent by the sphincter
The new species would try and crossbreed possibly, or see them as weak and kill them off and take their resources.
Answer:
Virus are a type of infectious agents it in almost all scenarios it will infect as many as cells it can before your WBC's can kill them
And in fact you are right now only in the state of Disease free. Every second your body is fighting off diseases. So to support your immune system eat Lots of Healthy food and stay safe!
The spiders that survived the first pesticide spraying were resistant to the pesticide and when they reproduced most of their offsprings got the gene of pesticide resistance.
When organic molecules decompose, energy is released.
