Select the most appropriate option to fill in the blank.

In space it is possible to identify and ________ some unique characteristics of human physiology and biology.

isolate

The correct option to fill in the blank is isolate.

The sentence is about identifying unique characteristics of human physiology and biology in space. The word "isolate" means to separate something from others. In this context, it means to separate the unique characteristics of human physiology and biology from the other factors that may affect them on Earth.

The other options are incorrect.

• Excess means more than is needed or wanted. This does not make sense in the context of the sentence.
• Replete means full or abundant. This does not make sense in the context of the sentence.
• Partition means to divide something into parts. This does not make sense in the context of the sentence.