<span>Anything in an organism's environment that causes it to react is called a STIMULUS. A stimulus is defined as an impulse that evokes a specific functional response from an organism. In living organisms, stimulus can occur both internally and externally. Stimulus generate appropriate response in living organisms. Thus, the correct option is C.</span>
The most important functions of the complement system are to alter microbial cell membranes and A. initiate an inflammatory response. The complement system is a part of the innate immune system, that is, the system is not adaptable and does not make alterations to the involved proteins over the life time of an individual. The complement system however enhances the functioning of the adaptive immune system by producing cytokines that overwhelm its response.
<span>Ask the teacher for instructions.</span>
<span>C. needed in small amounts.
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Minerals are also needed for the body although this should be taken in a very controlled amounts only.
Minerals and vitamins combined form the micro-nutrients of the body.
With micronutrients, only relatively little amount of nutrients is required to improve health. They are usually in milligram and microgram amounts and are enough to sustain to the metabolism and growth supplication. On the other hand, macronutrients are those that need large portions and quantities such as carbohydrates, fats and proteins. We need more of these to be converted to energy for movement and muscle growth. </span>
