Answer:
the answer is D) a structure composed of a number of tissues that work together to perform a specific task.
Explanation:
all organs work together to keep us healthy. that's why they're called "organ systems." a system works together!
Bacteria, molds and yeast are the most important microorganisms that cause food spoilage and also find the maximum exploitation in production of food and food products. Different strains of bacteria and fungus are used for fermentation of dairy products for production of a wide variety of cultured milk products.
Transporting oxygen and Nutrients throughout our body.