Answer:
C. Vaccination
Explanation:
vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism.
C because oxygen was a byproduct of photosynthesis and proved to be EXTREMELY important in the atmosphere.
Meteors is the correct answer. I’m just going to talk more to get this 20 word limit over so yeah no problem
Through analysis of ice cores, scientists learn about glacial-interglacial cycles, changing atmospheric carbon dioxide levels, and climate stability over the last 10,000 years. Many ice cores have been drilled in Antarctica.
Ovulation
That's when the egg "splits" from the oviduct
