Describe the scene in this photograph using the terms predator, prey, stimulus, and reaction. Identify the stimulus and reaction for each organism.

Leopard - predator, acting in response to stimulus - the hog, reaction - run after the hog: Hog - prey, acting in response to stimulus - being hunted by leopard, reaction - run.

Explanation: We can clearly see that the leopard is the predator here, acting in response to its stimulus - the hog. The reaction is to run after the prey  (the hog), which when the hog sees the leopard (stimulus) - attempts to run for its own survival (reaction).

this protocol provides a detailed procedure for chromatin immunoprecipitation (chip) to study the dna-protein interactions.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds