Here is the answer to the question above. The device that uses the force of the cow trying to walk through it to open, close and latch the gate is called a Vertically opening gate apparatus. Hope this answers your question. Have a great day!
I believe the answer to your question is external stimuli
Answer:
Salmonella can be spread by food handlers who do not wash their hands and/or the surfaces and tools they use between food preparation steps, and when people eat raw or undercooked foods (:
