sand dunes form from wind
Because the have hollow bones, feathers, wings, beaks, and they lay eggs
1
state the problem
2
hypothess (prediction)
3
design the experiment
4
record and analyze the date
5
conclusion (what did you learn)
Acute diseases are sudden, severe, and short term only. They quickly appear and worsen without warning and they disappear. Examples of this are flu or colds.
Chronic diseases, on the other hand, are long-developing diseases. The symptoms have been present for long time and it worsens as time progresses. Examples of this are Osteoporosis and heart disease.