Answer:
Fine focus.
Explanation:
If you're referencing a microscope, then it would be fine focus. Coarse focus is a basic focus used to properly see a specimen, while fine focus enhance clarity and precision. To use both, you have to gently twist a knob until you can see the specimen at a desired clarity.
Here's a reference image if you need it, it's labeled all the parts of a microscope.
The whale and the bat are the most different because of the size of the hands or fins.
And the human and the cat are the most similar because they are almost identical to each other from the bottom up
You can conclude that the one that were alike were related in some type of way
Invasive species or environment