Answer:
I believe the answer is D.
This is your perfect answer
Under the Onís-Adams Treaty of 1819 (also called the Transcontinental Treaty and ratified in 1821) the United States and Spain defined the western limits of the Louisiana Purchase and Spain surrendered its claims to the Pacific Northwest. In return, the United States recognized Spanish sovereignty over Texas.
The europeans brought infectuous diseses such as the bubonic plague, chicken pox, pneumonic plague, cholera, diphtheria, influenza, measles, scarlet fever, smallpox, typhus, tuberculosis, and whooping cough. The diseases introduced in the Americas by the Europeans were crowd diseases: that is, individuals who have once contracted the disease and survived become immune to the disease.
Answer:
d) All of these were not true
Explanation:
All the options above were all questioned by the Brelands. Instinctive drift as coined by Keller and Marian Breland who were former students of B. F skinner, asserted that operant conditioning theory wasn't true after their work on instinctive drift. Instinctive drift, a direct opposition to the operation conditioning theory of Skinner since an animal could still revert to unconscious behaviour after learning under operant conditioning.
Answer:
Available freshwater allowed people to grow food.
Explanation:
Water is super important for a lot of different reasons. The more water that people had, the more crops that they can grow.
