Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: The electron cloud of a helium atom contains two electrons, which can normally be expected to be equally distributed spatially around the nucleus. However, at any given moment the electron distribution may be uneven, resulting in an instantaneous dipole. This weak and temporary dipole subsequently influences neighboring helium atoms through electrostatic attraction and repulsion. It induces a dipole on nearby helium atoms (see Figure below ). Answer: an instantaneous dipole
[A]: A weak and temporary dipole that influences nearby atoms through electrostatic attraction and repulsion is known as what?

[Q]: Passage: Whales and bats have the trait of echolocation. This is the ability to locate objects in the dark by bouncing sound waves off them. The most recent common ancestor of whales and bats did not have this trait. Apply lesson concepts to explain how the trait evolved in whales and bats. Answer: echolocation
[A]: What term is defined as the ability to locate objects in the dark by bouncing sound waves off them.

[Q]: Passage: As plant cells grow, they also become specialized into different cell types. Once cells become specialized, they can no longer divide. So how do plants grow after that? The key to continued growth is meristem. Meristem is a type of plant tissue consisting of undifferentiated cells that can continue to divide. Answer: divide
[A]:
Once a plant cell becomes specialized, what can they no longer do?