Answer:
476 A.D
Dark ages.
Explanation:
In 476 A.D, the Roman empire was collapsed due to the Invasions by Barbarian tribes and inefficiency of the new kings led to the fall of Roman empire. Dark Ages or Early Middle Ages is the period in which there is little knowledge in Europe. The roman catholic church gain power by converting the barbarian tribes and quickly became the dominant form of Christianity. In the 10th century, the system of Feudalism developed in Europe. Iceland, the Faroe Islands, the British Isles, the Balearic Islands, Corsica, Sardinia, Sicily, Malta, Crete, and Cyprus are the major Island and Jutland, the Scandinavian, Iberian, Italian, and Balkan peninsulas are the major peninsulas of Europe.
Answer:
cross-sectional study
Explanation:
Dr. Milano compares the performance of a group of 20-year-olds, a group of 45-year-olds, and a group of 70-year-olds on several tests of fluid intelligence and several tests of crystallized intelligence. Dr. Milano's investigation BEST exemplifies a <u>cross-sectional study</u>. A cross-sectional study is a type of observational study that analyzes data from a population, or a representative subset, at a specific point in time, it involves the use of different set of people who differ in the trait of interest. For example, the effect of age on intelligence level will involve the selection of subjects across the cross-section of ages of interest.
<span>According to Dr. Tomasello, one explanation for how chimpanzees learn the orangutans in the video to use a stick to fish for honey is that the skill is</span> which is an example of
insightful problem solving by
nonhuman primates.When a researcher Jane Goodall decided to go and
live among chimpanzees in Tanzania she made the groundbreaking discovery that
chimpanzees are capable of making their own tools and then used them. Before
1960 it was only known for man to exhibit such traits.
Scientists can use the color of minerals to tell them apart.
Idiochromatic minerals <em>(self-colored) </em>due to their composition. The color is constant and predictable.
Allochromatic minerals <em>(other colored) </em>due to trace impurities or defects in their structure. The color is variable and unpredictable.
Pseudochromatic minerals <em>(false colored)</em> due to effects produced by light. The color is variable but a unique property of the mineral.