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NAME: ________________________________________________ PERIOD: ________ UNIT 3 PART 4 WORKSHEET 1. A newly formed organism just starting to develop is called an ________________________________. 2. Development involves ______________________________, ________________________________, and _____________________________________________________. 3. Cleavage is _________________________________________________________________________. 4. As the embryo develops it forms a solid ball of cells called a __________________________________. eventually this forms a hollow ball called a _____________________________________ and the space inside is called the ____________________________________. When one side pushes in a ______________________________ is formed. Once a third layer of cells starts to grow there are now three ______________________________________________________________________. 5. When cells change to become specific types of cells it is called ________________________________. These cells then form different organs. If they all start out the same, how do they end up different? _______________________________________________________________________________ 6. Fill in the blanks with ectoderm, endoderm, or mesoderm. ______________________________ forms the nervous system ______________________________ forms bones ______________________________ the outside layer ______________________________ forms the lining of the stomach ______________________________ the middle layer ______________________________ forms the lungs ______________________________ forms the skin ______________________________ the inside layer