Scientists are trained observers. What is a scientific observation? It's an observation that anyone can make and the result will always be the same. What's an unscientific observation? It's an observation that not everyone would agree on.
These are scientific observations. Everyone who looks at the tree can see that it has a trunk, branches, and leaves. Everyone who measures the trunk would get the same results.
These are not scientific observations because "a funny shape" and "wide" means diferent things to different people.
Many tools can be used to collect data that everyone agreess on. What's your normal body temperature? A thermometer can tell you. What's the structure of a strand of your hair? Look through a magnifier or a microscopic, and you will find the answer. What's the weight of a brick? A scale will give you the answer. Could you just say a brick was heavy? Yes, but that would not be a scientific observation. The word "heavy" means different things to different people.
