WHAT DOES THE SENTENCE “ALTHOUGH THESE ORCA GROUPS MAY SEEM SIMILAR...

9.

What does the sentence

“Although these orca groups may seem similar to the naked eye, they are

extremely different in many ways” in the third paragraph mean?

A. They appear in various ways in front of naked eyes.

B. Their huge size makes it difficult to follow them.

C. We can recognize the differences between the groups without naked eyes.

D. The differences between these groups are not easy to recognize.