Biology
Which of the following is an example of parasitism?

All of these
Ticks that live on dogs
Aphid insects eat the sap of the host plant
Leeches consume blood of their host

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Biology
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?

You are infected by a virus
You need to be vaccinated instead of taking an antibiotic
You need an antiseptic, not an antibiotic
Having waited a day, it is too late to take an antibiotic

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