Sample Response:
Bacteria are helpful because they produce oxygen, which our bodies need to breathe, and they help us to digest the food we eat. Bacteria are also helpful because they are used in medicine to help us overcome disease. Bacteria are harmful because they can cause tooth decay and illnesses that can be either common or quite serious.
This is a sample response, so it's 100% correct. Peace!
Teperature
Ph level
Substrate concentration
Not sure if these are physical but hope it helped.
The answer tot his question is:
<span>Fill in the blank.
</span>A scientific ___________ is a proposed explanation that can be tested."<span>Scientific Theory."
Hoped This helped, </span><span>
Jaylamariejohsov5zsb
Your Welcome:) </span>