Answer: (B) Ribosomes make proteins
Explanation: Ribosomes are just the sites where proteins are made and has nothing to do with communication.
Correct me if I'm wrong but I believe it is the Gravity (or Gravitational Pull) from the Sun.
Answer:
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Answer: Paleozoic
Explanation: The Paleozoic Era, which ran from about 542 million years ago to 251 million years ago, was a time of great change on Earth. The era began with the breakup of one supercontinent and the formation of another plants became widespread. And the first vertebrate animals colonized land.
