What is a scientific theory?
a.
a reasonable guess based on instinct
b. an imaginative idea explaining natural phenomena
c. a broad, evidence-based explanation for a phenomenon
od.
a tentative statement with little or no predictive power

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )