At the center of all analysis of the marketing environment is the and the consumer's specific behaviour and attitudes.

The missing part of your sentence seems to be referring to the "consumer". At the center of all analysis of the marketing environment is the "consumer" and the consumer's specific behaviour and attitudes.

Here's why:

1. Identify the Subject: In marketing, the primary focus is always the consumer. They are the ones who purchase and use the products or services, so understanding them is crucial.

2. Understand Consumer Behavior: This involves studying the decisions that consumers make when purchasing products or services. This can include what they buy, why they buy it, when they buy it, where they buy it, how often they buy it, and how often they use it.

3. Analyze Consumer Attitudes: This involves understanding the consumer's attitudes towards a product or service. This can be influenced by a variety of factors, including personal preferences, social influences, and psychological factors.

4. Apply the Analysis: The information gathered from analyzing consumer behavior and attitudes is then used to develop marketing strategies. This can include product development, pricing strategies, promotional campaigns, and distribution strategies.

So, the complete sentence would be: "At the center of all analysis of the marketing environment is the consumer and the consumer's specific behaviour and attitudes."