Question

plsss helpp quickkkk

Answer 1

16. penicillin
17. ecological
18. life story
19. health threat
20. life science

Hope this helped

Answer 2

I will try my best, some of these may be wrong. If so I’m sorry.
16. - penicillin
17. - filthy (this one mag be wrong)
18. - life story
19. - death (May also be wrong)
20. - life science
By the way, a synonym is a word that means the same or nearly the same.