This figure shows the process of clonal selection and clonal expansion in the vertebrate adaptive immune system. Describe two steps in this process that resemble evolution by natural selection. 
Definitions:
Realistic
A characteristic of something or someone being true to life or showing a practical understanding of situations and making practical judgments.
Smart
Exhibiting intelligence and adaptability, often used to describe devices with advanced technological capabilities that can perform tasks or make decisions autonomously.
Base Coating Paint
The initial layer of paint applied to a surface, designed to improve the adhesion, durability, and appearance of subsequent layers.
Call Objective Requirements
The specific goals or outcomes a salesperson aims to achieve during a sales call.
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