How did the earliest chordates obtain food?
a. They were filter-feeders
b. They were herbivores, consuming photosynthetic algae.
c. They had symbiotic green algae that produced most of their energy.
d. They were predators, catching mostly marine crustaceans.
e. They were decomposers, consuming dead worms and crustaceans.

Option A.

They were filter feeders.

Explanation:

The first chordates appear in the Cambrian period and the fossil record shows it to be around 530 milion years ago. This chordates was found in China and recorded in 1995.

The earliest chordates obtain food by filter feeding. They taking in water through the mouth and filter the feed through gills silts.

Chordates characteristics are;

They have notochord.

They have hollow nerve

answer: glucoamylase presented optimum activity at temperature of 55â°c, and, in the glycosidic bonds from the non-reducing ends of starch, resulting in the production of glucose. source and type of fermentation can affect the enzyme's properties

credit to kalahira