The correct answer is D. Bird flu.
Polio and smallpox are very rare today as they were eradicated hundreds of years ago and TB has been around for maybe thousands of years. Bird f!u was discovered in 1957.
Passing through clay beds affect groundwater because it will take time for it to pass and penetrate through clay. Water cannot pass deeper to get across, the direction is horizontal to the most penetrable part of the soil where it can pass.
Answer:
Crop rotation
Explanation:
It is done so that the soil of farms is not used for only one set of nutrients. It helps in reducing soil erosion and increases soil fertility and crop yield.
Incisors : bite food .
Canines : tears down the food into further smaller pieces
