Weegy: The brain and spinal cord are part of the Peripheral nervous system.
User: the electrical charges that act as nervous signals are called _______.
Weegy: The electrical charges that act as nervous signals are called: nerve impulses.
User: Jellyfish do not have a brain. Instead their nervous system is called a _______.
Weegy: Jellyfish do not have a brain. Instead their nervous system is called a Nerve-net.
User: After nervous systems began to develop in bilaterally symmetric animals, some developed ventral, or front, nerve cords, while chordates developed _______ nerve cords.
Weegy: After nervous systems began to develop in bilaterally symmetric animals, some developed ventral, or front, nerve cords, while chordates developed DORSAL, or back, [ nerve cords.
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User: Skeletons that allow for movement by using muscles and squeezing liquid to change the body shape are called _______ skeletons.
Weegy: Skeletons that allow for movement by using muscles and squeezing liquid to change the body shape are called hydrostatic skeletons.
User: _______ do not grow with arthropods, and so occasionally must be shed and regrown from chitin.
Weegy: Exoskeletons do not grow with arthropods, and so occasionally must be shed and regrown from chitin.
A
User: Muscles move endo- and exoskeletons by _______.
Weegy: Muscles move endo- and exoskeletons by contraction/contracting.
User: _______ is the joining of two gametes called sperm and egg.
Weegy: Fertilization is the joining of two gametes called sperm and egg.
User: A fish that lays her eggs in a cluster is initiating _______ fertilization.
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