They decrease because the zebra mussel were taking their resources. Leaving them nothing to eat.
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The type of operations used for transforming plaintext to cipher text, the number of keys used, and the way in which the plaintext is processed.
Answer and Explanation:
Consists of the brain and spinal cord
- central nervous system
Consists of the nerves outside the brain and spinal cord
-peripheral nervous system
Collects information from sensory organs
-peripheral nervous system
Processes information from sensory organs-central nervous system.
The CNS is made up of the brain and the spinal cord. The PNS consists of nerves, which link the CNS to various receptors and effectors.