Examlex
Which of the following is NOT a way of controlling extraneous variables?
Sarcomere
A segment of a striated muscle cell located between adjacent Z lines that serves as a unit of contraction.
Exoskeleton
An exoskeleton is a rigid external covering for the body in some invertebrate animals, especially arthropods, providing protection and support for the organism.
Gastrovascular Cavity
A gastrovascular cavity is a single internal cavity in certain simple animals that acts both in digestion and the distribution of nutrients.
Pedal Disk
The base of a cnidarian, such as a sea anemone or coral, that attaches to a substrate.
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