Almost half the birds in the yard were brown cardinals and the rest were bright red cardinals, so Jimmy perceived them as two distinct groups of birds. This best illustrates the principle of:.1. Connectedness2. Similarity3. Closure4. Relative clarity

Similarity

Explanation:

The similarity among the individuals can be defined as the principle in which the organism or object are separated based on criteria.

The criteria can be color, feature, similar process, et cetera. Here, the birds are separated based on the character of similarity on cardinal.

The similarity here is in the cardinal color of the bird. One of the cardinal color of birds is red and the other one is brown.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.