What characteristic of the species level of organization distinguishes two similar organisms such as ducks and geese as different species?

You arrive late to a biological seminar. however, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. immediately, you know that they are talking about a: ]

When a doggo starts to pace around in the same line for a hand full of days. what would that mean?

What are the ingredients of oobleck?