Answer:
Roman construction materials
Roman construction is famed for the use of concrete and the buildings at Portus are no exception. Roman concrete is composed of mortar and aggregate. The mortar was a mixture of lime and a volcanic sand called pozzolana.
Explanation:
The answer is T<span>he central government under the Articles had very little power.</span>
"Epidemiological study" type of research studies populations and is often used to search for correlations or associations between dietary habits and disease incidence.
<u>Explanation:</u>
"Epidemiology" is the study about human's diseases or other animal populations to detect and analyse how, when and where they occur. The study try to determine which factors are associated with disease termed as risk factors and which factors can protect people or animals from disease termed as protective factors.
Therefore "Epidemiological study" type of research studies populations and is often used to search for correlations or associations between dietary habits and disease incidence.
Answer:
D). Diverse climates provided good conditions for growing a variety of crops.
Explanation:
The role that climate play in developing the ancient civilizations in East Asia would include the <u>'diversity of climates providing good and effective conditions for cultivation which eventually helped in gorwing a wide variety of plant groups</u>.' The elevation in latitudes led to the variation in air and wind blowing in different regions as well as the soil, rain, and temperature which proved to be a great source for growing distinct crops. Thus, <u>option D</u> is the correct answer.