4. Researchers believed that floral scent can sometimes improve a person's learning ability. They set up an experiment in which each of 22 subjects completed sets of mazes. Each subject wore a floral-scented mask and an unscented mask in random order. The researchers measured the time to complete the sets of mazes.
What is the explanatory variable (factor)?
The amount of scent. Presence or absence of the floral scent. Time to complete the pencil and paper mazes. Whether the subject was able to complete the mazes quicker while wearing the floral scented mask.

1of the following choices, which one best describes one way that christianity came to east africa? a. christians traveled in caravans through the sahara desert and introduced the people of mali to a new religion. b. christian traders from the mediterranean interacted with the people of axum. c. christian military from west africa traveled across the continent to bring their religion to the people of east africa. d. christian rulers from asia traveled to east africa to bring their religion to the people. 2 which trade item from outside the region did west africans need most? a. gold b. camels c. salt d. iron

The social contact theory states that

What’s the reason for not digging up aztec ruins in modern mexico city