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This structure enters into the uterus.

In order for a muscle to contract for movement, what is required?

The notochord will eventually develop into the  

single fertilized cell is called the

hollow ball of cells is called the

Sperm cells are 

The type of muscle that lines the digestive system and involves movement of food is

In the sliding filament model for muscle movement, which protein slides?

The basic unit of contraction is called a

Which group has more members?