Dietary and/or can increase blood ldl concentrations.

a. saturated fatty acids, trans fatty acids

b. omega-3 fatty acids, trans fatty acids

c. omega-3 fatty acids, cis fatty acids

d. fiber, omega-6 fatty acids

e. polyunsaturated fatty acids, monounsaturated fatty acids

substitution is the answer in this case

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.