Every time Carol makes her favorite multigrain sandwich, the taste seems different. She usually has just a general idea about ingredients and often prepares more than she can eat. She often wastes a lot of food. Clearly, Carol is not using a recipe.

fixed

Explanation:

Clearly, she isn't using a fixed recipe if the taste is different each time.

Carol is not using a fixed recipe.

Explanation:

Carol thinks she can make the sandwich normally without instructions. She fails at doing this so the only answer would be fixed.

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b) the heart is a pump made of muscle and that is difficult to grow in the lab.