|Insulin and glucagon are ____ that regulate blood glucose.
|Your trachea divides into two main ____ that lead to your lungs.
|Incisors, canines, ____, and molars are types of teeth.
|Red blood cells, also known as ____, deliver oxygen.
|Human cells organize first into ____ and then into organs.
|White blood cells, also known as ____, are needed for immunity.
|Humans have 20 primary and 32 permanent ____.
|The structure of your ears and nose is made of ____.