useless trivia: What Word Means: Divided In Two?

Questions

To make half a kilo of honey, bees must collect nectar from over ___ _______ individual flowers?

Vampire Bats can hear sound frequencies which are over _____ times higher than any picked up by the human ear?

The male Californian sea-otter grips the nose of the female with his teeth during?

The heart of giraffe is two feet long, and can weigh as much as ____ ____ pounds?

The smallest trees in the world are Greenland?