is it advisable to switch on the microscope while looking through the eyepiece

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

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin