Samantha always turns the aquarium light on before putting fish food into the tank. After a while she notices that the fish swim to the top to look for the food as soon as she turns on the light. In this example, the is the unconditioned stimulus.4

the contamination

we are putting to many trash.

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.

answer; an inhibitory postsynaptic potential;