Answer:
An anaerobic organism or anaerobe is any organism that does not require oxygen for growth. It may react negatively or even die if free oxygen is present. In contrast, an aerobic organism (aerobe) is an organism that requires an oxygenated environment.
Explanation: btw thanks to, microscopemaster.com for helping me.
I think the answer is unas
Because if you putter together is
Unas palabras because the word end in s and the other word end in s too so is unas
Opciones por favor............¿
"participaban" should be in the blank.
