GIVING BRAINLIEST Why is it difficult to create a vaccine for the flu? A. a failure to induce immune response

B. antigen shifting

C. a loss of immunity

D. antibody shifting

Blood, made up of red and white blood cells, work together to form

Sammi is studying the interaction of the digestive and circulatory systems in the human body. she has listed various processes that occur in each of the systems. put the processes in order to describe the interaction between these two systems. tiles nutrients diffuse through the villi of the small intestine.digestive processes break nutrients down in the mouth, stomach, and small intestine.blood is pumped through the circulatory system to deliver nutrients to other organs.nutrients are ingested at the mouth.nutrients enter the capillaries of the circulatory system. sequence

What will happen if deforestation continue to destroy the green plant on the planet