1.The four major kinds of natural vegetation in the U. S. and Canada are grassland, desert scrub, tundra, and what Permafrost
Swamp
Forest
Lakes

2.The separates the east flowing rivers from the west flowing rivers.
Death Valley
Ohio River
Mississippi River
Susquehanna River

3. 2nd largest mountain ranges found in the United States, located on the eastern part of the United States. *
4 points
Rocky Mountains
Andes Mountains
Himalaya Mountains
Appalachian Mountains

1. permafrost

2. I think it's the mississippi river

3. Appalachian Mountains

Explanation:

the apache were not receiving guns from the spanish.(a) is the correct

explanation:

a hypothesis is an expected answer to a question, usually based on some theory or prior research. hypothesis testing is a method of determining the viability of a hypothesis. let’s use the us presidential election as an example. there are many hypotheses (questions) about how people feel or whom they will vote for. the only way to know the 100% “truth” about the answers to these questions is to ask every single possible voter – something that is impossible, expensive, time consuming etc. instead, we take samples and use statistics to make “best guesses” about the answer to a particular hypothesis. we never know for sure if our conclusion is right at the time we accept/reject it, but these techniques, when used appropriately can get us close to the truth most of the time (which is a lot better than guessing, flipping coins or throwing darts to get answers).

the tricky part about hypothesis testing is that we have to think somewhat backwards about it – we have to test what is known as the “null hypothesis”. as an example, the hypothesis might be “obama is more popular than romney” while the null hypothesis is “there is no difference in popularity between obama and romney”. we focus on the null hypothesis because it tells us exactly what the expected value of our tests should be (obama popularity = romney popularity) and we can collect data and see if it comes out that way (see next section on “significance”). if it does, then we “accept the null hypothesis” and reject our original hypothesis. if the null hypothesis is disproven, we look at the data to see if our original hypothesis holds (obama> romney).