user: Where do black walnut trees grow?

assistant: North America from southern Ontario, west to southeast South Dakota, south to Georgia, northern Florida and southwest to central Texas.

user: Where is the village of Congosto

assistant: Congosto is a village and municipality located in the region of El Bierzo (province of Leon, Castile and Leon, Spain). It is located near to Ponferrada, the capital of the region. The village of Congosto has about 350 inhabitants.

Its economy was traditionally based on agriculture, wine and coal mining. Nowadays, most of the inhabitants work on the surrounding area on activities such as wind turbine manufacturing or coal mining.

Congosto also a large reservoir in its vicinity, the Barcena reservoir, to which many tourists visit during the summer.

user: Given this paragraph about different types of eyes, how are eye types categorized and why?

assistant: Eyes are categorized into two types, "simple eyes" and "compound eyes". In this case, "simple eyes" do not mean that they have reduced complexity or acuity, but rather that they have one concave photoreceptive surface. This is in contrast to "compound eyes" which are comprised of a number of individual lenses on a convex surface. In other words, eyes fall into two groups based on their photoreceptor's cellular construction either being cilliated (as in the vertebrates) or rhabdomeric.