Question

within phylum chordata, which of these is a feature found in the pharynx of humans and fish?
a notochord
pharyngeal slits

Explanation:

1. Recall the characteristics of Phylum Chordata: Chordates have pharyngeal slits (or pouches in some, like human embryos), a notochord, dorsal nerve cord, and post - anal tail at some stage.
2. Analyze the options:

• A notochord is a rod - like structure that in humans is replaced by the vertebral column during development and is not a feature of the pharynx.
• Pharyngeal slits are present in the pharynx region of both fish (used for respiration, filter - feeding etc.) and in human embryos (pharyngeal pouches, which are evolutionary remnants and related to the structure's development). So within the pharynx, pharyngeal slits (or their developmental equivalents) are a feature shared in the pharynx - related structures of humans and fish.

Answer:

pharyngeal slits