In his international product life cycle (iplc) theory, raymond vernon observed that each product and its manufacturing technologies go through three stages of evolution: introduction, maturity, and

Decline.

Explanation:

There are actually 5 stages: introduction, growth, maturity, saturation and decline. In the decline stage, the product is well known and it starts declining until it is no longer feasible to produce that item.

answer; consonant;

answer; acquired mainly during early childhood;