You're right to notice that organisms classified in the same genus are more alike than those in the same class. This is because the Linnaean classification system is hierarchical, meaning that each level of classification becomes more specific and includes organisms that share more characteristics. Here's a breakdown:

* Class: A class is a very broad category. For example, the class Mammalia includes all mammals, from mice to whales. This means there's a vast range of differences within a class.

* Genus: A genus is a smaller, more specific group within a class. Organisms within the same genus share a common ancestor and are more closely related than those in the same class. They often have similar physical characteristics, behaviors, and ecological roles.

* Species: The most specific level of classification, a species refers to a group of organisms that can interbreed and produce fertile offspring. Organisms within the same species are the most closely related.

Think of it like this:

* Class: Like a large library with many different sections.

* Genus: Like a specific aisle within the library, focusing on a particular subject.

* Species: Like a single book on a shelf within that aisle.

Therefore, organisms in the same genus are more alike than those in the same class because they share a more recent common ancestor and have more similar characteristics.

Let me know if you'd like any examples!