In lancelets, water the has filtered across the gill bars and has picked up metabolic waste products from the nephridia exits the body through the ( ), while indigestible food is eliminated from the body through the .

1. atripore

2. Anus

Explanation:

Lanceletes are the modern survivors of the lineage called primitive Chordata which were considered the ancestors of the chordates.

The organism possesses a circulatory system, a digestive system, a notochord and the gill slits.

1. Water is absorbed through the mouth in which the water passes through the gill slits and the food material is absorbed by the mucus. This water then passes out of the gill slits and an atrium through a pore called the atripore.

2. The indigestible food or waste product is eliminated from the body through a structure called anus present at the posterior end.

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