Question

which of these are bio indicator of air pollution
a. algae
b. ferns
c. mashroom
d .lichens
please answer fast
i'll mark you brainlist

Answer 1

Explanation:

$\huge\star\pink{{Hey Dude}}$

❤Lichens❤

Answer 2

Answer:

I think algae

Explanation:

Becoz we can find it every were