Question

Question 1: Who discovered vaccine?
Question 2: Name two unicellular algae.

Answer 1

Most probably Edward Jenner was the first to invent vaccine.
Two unicellular algae are:
Chlamydomonas
Desmid algae

Answer 2

It depends on the disease for which the vaccine was discovered. But the earliest works regarding vaccination was done by Edward jenner.
Unicellular algae
chlorella
chlamydomonas
Spirogyra ( unicellular and filamentous )