Your inspection report does not need to include information on
a. adequacy and condition of flashing.
b. steepness of roof pitch.
c. condition of solar heating system equipment.
d. type and condition of gutters and downspouts.

The answer in the above statement is letter B. Your inspection report does not need to include information on the steepness of the roof pitch. It can only include the adequacy and condition of flashing, solar heating system equipment, type and conditions of gutters and down sprouts.

1. Knapping

2. Different technique implies different people

3. The desert areas of nowadays Arabia were once green areas.  

4. Food shortage and/or climate changes

5. See explination nr. 2

Explanation:

1. 'Knapping' is the process of knocking of flakes of a stone.

2. Theories of archeologists are very often based on (logic) assumptions. When there is a certain stone tool technique in one and another in a different place, they assume they must be from different people.

3. The migration by land was made possible through climate changes that ranges from an ice corridor that once connected Alaska with Iberia, to more hospitable environments of lakes and rivers with an abundance of plants and animals in what is now the Arabic desert.

4. The same climate change (warming up) that caused more hospitable environments - deeply connected with foodsupply - along the mediterranean sea might have caused a dryer and less hospitable environment in East Africa.

5 is answered the same way as question nr. 2 but now with the same tools, and thus the same people who must have traveled.

P.S. Archeologists agree on the emigration of early humans from Africa to other continents; they don´t agree on When. Genetic study claims that it was about 60.000 years ago, but the findings at Jebel Faya and other places suggest that this might have happened (much) earlier.