​The Vertebrate Lung First Appeared in ____

question 83

Multiple Choice

​The vertebrate lung first appeared in ____.

• A) ​fishes
• B) ​amphibians
• C) ​reptiles
• D) ​birds
• E) ​mammals

---

Definitions:

Part Performance

A legal principle that allows an incomplete contract to be enforced if one party has taken significant actions based on the agreement, demonstrating the existence of the contract.

Oral Promise

An agreement made verbally that may or may not be legally binding, depending on the context and content.

Modification

The process of making changes or alterations to something, such as a contract or plan, to correct or improve it.

Oral Contract

is an agreement between parties that is spoken and not written, yet it is legally binding.