| Answer | Crossword Clue |
|---|---|
| monocardian | a creature that has only one heart |
| ephemerals | EPHEMERAL, a creature, such as a mayfly, that lives for one day only |
| ephemeral | existing only for a day, or short period / a creature, such as a mayfly, that lives for one day only |
| monoptote | a noun that has one grammatical case only |
| monoptotes | MONOPTOTE, a noun that has one grammatical case only |
| ANI | April is the only month that has one |
| homogametic | Denoting the sex that has sex chromosomes that do not differ in morphology, resulting in only one kind of gamete, e.g., (in mammals) the female and (in birds) the male |
