Well, if one of the major species, that a certain animal eat disappeared, then it would effect the animal that ate it. Then, if that animal doesnt get fed, or eat the right things, it will die, and so will the animal that eats it. Its like the domino effect, if one goes down, so does everything else.
~Hoep this helped :)
Nalah could use only 1 rat and test it multiple times.
In the two-streams hypothesis, a model for the process of vision, information moves from the striate cortex to the parietal lobe by way of the morsel stream also called the where pathway. This pathway is involved with defining the spatial qualities of an object relative to the viewer.
I believe it is D. but i am unsure and i hope i helped u :)