Answer: The Dust Bowl was caused by several economic and agricultural factors, including federal land policies, changes in regional weather, farm economics and other cultural factors. After the Civil War, a series of federal land acts coaxed pioneers westward by incentivizing farming in the Great Plains.
Explanation:
1) Manifest Destiny: The US Government wanted settlers to move onto the Plains as they needed the land to be settled and farmed and for communities and towns to grow up and expand. This was needed if the USA was to be a rich and successful country. The government therefore promoted the idea of Manifest Destiny.
Answer:
familiarity
Explanation: your bodies immune system remebers past aliments in case it faces them again so a vaccine in your body helps your body build up immunity to the ailment before it overwelhms you like a guy took small amounts of black mamba venom until his immune sysste was so used to it he could take a bite and survive unscaved
Answer: Two heterozygous (both with example genotype Pp) can have a homzygous child (with phenotype PP or pp)
It decreased the amount of carbon dioxide in the air and increased the amount of oxygen because plants go through photosynthesis and convert carbon dioxide to oxygen in the process.