Practice problem
Which of these is a scientific theory?
Dogs are the cutest animals on earth.
People are so attached to their pets because evolution has made us crave cuddly contact.
Organisms have evolved from prior organisms via natural selection.
There are more cats than dogs in American households because it's easier to have more than one cat than it is to have more than one dog.
Type a concept, like “slope” or “photosynthesis”.
