The 3Rs by Russell and Burch are known to be the "alternative methods" to improve the treatment of laboratory animals, at the same time to advance the quality of science that uses animals for studies.
The 3Rs are Replacement, Reduction, and Refinement. Replacement is defined as minimizing the pain and suffering of the animals used in research. Reduction is for reducing the number of animals being used, and using healthier animals. Replacement is using alternative to animals such as tissue cultures and computer models.
<u>Answer:</u>
Better seeds is the characteristics that early people control in order for agriculture to expand.
Option: (D)
<u>Explanation:</u>
- For the agriculture to expand the major thing is the seeds. Only when the seeds are good, the product appears to be good.
- So, by improving the access to water, clay or any other aspects the agriculture won’t expand unless the seed is good for the production.
- This method of applying the better seeds for good agricultural product was used by early people rather than seeking for good access to water and clay.
Answer:
Most of those enslaved in the North did not live in large communities, as they did in the mid-Atlantic colonies and the South. Those Southern economies depended upon people enslaved at plantations to provide labor and keep the massive tobacco and rice farms running.
Explanation:
