<p>Observations of diverse animal species (show that) the (most successful) in the struggle for survival are (those which) are most (adaptable to) changes in their world.</p>
<p>The error is in show that.</p>
<p>I need an explanation for why it is wrong, I really don't understand.</p>
<p>Are you sure that the word is “observations” and not “observation”? If the sentence is what you say it is, the answer should be no error.</p>
<p>^either what burgerking316 said: Observation - “shows” that
or if you typed every single word correctly, I would say “show that” is wrong because the verb “show” should be past tense? = “showed?”</p>
<p>This is a typo. show that is an error in the original sentence because it does not agree with the subject, observation.</p>
<p>It’s observation, can someone please give me an explanation?</p>
<p>Observation of diverse animal species (show that) the (most successful) in the struggle for survival are (those which) are most (adaptable to) changes in their world.</p>
<p>Subject verb agreement. The subject of the sentence, observation, does not agree with the verb, show. Show must be changed to a singular verb, shows.</p>
<p>If the sentence should read:</p>
<p>Observation of diverse animal species “show that” the most successful in the struggle for survival are those which are most adaptable to changes in their world.</p>
<p>Then the correct answer is SHOWS because the subject of the sentence is Observation and Observation is a singular noun, and since this pertains to subject-verb agreement, the verb must take singular form.</p>
<p>If the subject is singular, verb must be singular
if the subject is plural, verb must be plural</p>