What is a food chain and what does it do?

A food chain is a hierarchical series of organisms each dependent on the next as a source of food or the series of processes by which food is grown or produced, sold, and eventually consumed.

Here is an example ↓↓↓

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

a covalent bond, specfically triple bond