A cloth is tightly wrapped round the arm at point Z and the veins stand out Clearty. One finger presses firmly on the vein at W.

When another finger strokes the vein, as shown In the diagram, the vein lies flat between points
Wand Y.

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

You want to cultivate some exotic plants at your farm. however, the climate is chillier than the temperature range favorable to the crop. which is the best method to use for the cultivation of this exotic crop? a. use a crop rotation method b. use a lot of fertilizer c. prepare the seed bed properly d. use a greenhouse e. use irrigation

They live on every continent except antarctica