When peering into a dark house from outside, you often get right up to the window and cup your hands around the side of your head. why?

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

Blood stem cells may develop into any kind of human blood cells. what kind of stem cells are blood stem cells? a. multipotent stem cells o b. totipotent stem cells o c. pluripotent stem cells o d. unipotent stem cells

Describe characteristics of a good respitory surface