Question

select the word that means become weaker.
pheidole dentata, an ant of the southeastern united states, is unique when it comes to age. scientists studying the ant found that older worker ants were able to do tasks just as well as younger ants. this is not the case for most animal species. humans, for example, see their abilities to do many tasks decline with age.

Explanation:

The task is to find a word that means 'become weaker'. The passage gives an example of humans whose ability to do tasks declines with age, and 'decline' means to become weaker or go down in quantity, quality etc.

Answer:

decline