Aneuroscientist records neuronal firing from hillary's retina and notices that her m-cones and l-cones are both firing at an equal rate. from this, hillary is probably looking at a:

The correct answer is bowl of lemons.

Neuroscientist is termed as a scientist whose work is to specialize in neuroscience. It deals with neural circuit, biology of neurons, anatomy, and biochemistry.

They carry out experiments which are concerned about nervous system which include the brain and also their functions.

the answer is a or when it says crossing over

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: