What is the subject of the sentence?

Here in the deepest recesses of the ocean (is, are) some of the most mysterious creatures on Earth.]]> Is the subject sentence singular or plural?

Here in the deepest recesses of the ocean (is, are) some of the most mysterious creatures on Earth.]]> Here in the deepest recesses of the ocean are some of the most mysterious creatures on Earth. Type the correct form of the words in parentheses into the box, then submit it and say the sentence.

Here in the deepest recesses of the ocean (is, are) some of the most mysterious creatures on Earth.]]>