Bone marrow. The inside of your bones are filled with a soft tissue called marrow. There are two types of bone marrow: red and yellow. Red bone marrow is where all new red blood cells, white blood cells, and platelets are made.
Mine is 8m x 7m (3m is 10 feet, so around 27 x 23 feet). This is normal for an Australian classroom, although there's a fair bit of variation.
The students clearly know what is expected of them at various points in the 15-minute. window described above â everything from what to do when their teacher appears on the playground, to. how to walk through the hallway, to how to enter the classroom, to how to share their responses to the. warm-up activity.