For the following sentences, select the letter of the incorrect past tense verb in each group. When experts studyed the near-perfect remains, their findings revealed that Lyuba nursed its mother's milk but also swallowed bits of mammoth dung, just as baby elephants do today to build up healthy bacteria in their intestines.

A) studyed
B) revealed
C) nursed
D) swallowed

Mammoth Dung

Preserved feces from the extinct species of large, hairy elephants known as mammoths, often studied for scientific research on ancient environments.

Healthy Bacteria

Beneficial microorganisms that reside in the body and contribute to its normal function, particularly in the digestive system.

Intestines

The lower part of the alimentary canal from the end of the stomach to the anus, involved in digesting food and absorbing nutrients.