Strawberry plants typically reproduce by making runners, which are miniature versions of themselves, that grow off of the roots and stems of the parent. this type of vegetative reproduction is known as

This is an example of vegetative propogation.

Vegetative propagation is the method by which a whole plant is grown from a single part of plant such as roots, stem, leaves, etc. In case of strawberry the runners of the plant is used to grow a new plant. These runners are called stolon which develops its own roots and when these adventitious roots are establish in soil the runners dry and the roots helps to develop a new plant.

your answer is "the 1950's"

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high