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malfutka [58]
3 years ago
12

What is NOT part of the present-day solar system? A. the Sun B. the planets C. the solar nebula D. the planetary moons and rings

Biology
1 answer:
Wewaii [24]3 years ago
6 0
The answer is C. The Solar Nebula
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Backup reinforce is a reinforcer that serves as the foundation for a conditioned reinforcer. It is a reinforcer in a token system for which tokens can be traded in order to keep their reinforcing properties. For instance, poker chips can be converted into cash at the conclusion of a game of poker. The money serves as a secondary reinforcer in this situation. It is allowed to use any two relevant examples.

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