A deuterostome is a type of animal that belongs to the subgroup of chordates, which includes all vertebrates (such as humans, fish, and birds), as well as some invertebrates (like tunicates and lancelets). The term "deuterostome" comes from the Greek words "deuteros," meaning second or secondary, and "stoma," meaning mouth. This refers to the fact that the mouth cavity of deuterostomes develops secondarily, after the blastopore forms.<br><br>In other words, the mouth of a deuterostome is formed from the blastopore, which is an opening in the embryo that gives rise to the digestive system. In vertebrates, the blastopore eventually closes and forms the anus, while in deuterostomes, it remains open to form the mouth.
Devalued means having a reduced value or worth, often due to a decrease in price or value. It can also refer to something that has lost its importance or significance. For example: "After the economic crisis, the country's currency was severely devalued."