The response to your inquiry is b.
Two claims support the assertion that Jenner is credited with initiating and promoting immunization practices:
- Jenner's interest in cowpox's protective features started during his apprenticeship. It reveals that Edward Jenner engaged in methods to safeguard against diseases from his teenage years. He learned that farm workers who had been infected with cowpox had immunity to the smallpox outbreak prevalent in Europe at that time. This led him to develop a cowpox-based vaccine.
- Jenner took initial measures to eliminate smallpox. He first tested his smallpox vaccine on a child in 1796, who did not contract the disease. To gain validation from authorities, he then vaccinated 22 additional individuals, achieving successful results.
During an earthquake, energy spreads outward in every direction from the source area, referred to as the -FOCUS-
The metal alloy that constitutes Earth's core is distinct in terms of chemistry, while having a similar density compared to the rocky mantle.
The answer is C. San Francisco. Explanation: The San Andreas and Hayward faults, which are in proximity, generate significant tectonic activity in this area. Consequently, regions near these faults are more susceptible to tsunamis caused by the displacement of the ocean floor during earthquakes. Additionally, many islands and bays previously established are also periodically affected.
