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.
Answer:
1. Germany invades poland Sept. 25th 1941
2. France falls to German forces June 22nd 1940
3. Battle of britain. Jul, 10th 1940
4. Japan bombs pearl harbor nov, 25th 1941
Answer:
A gravitational singularity is a one-dimensional point which contains a huge mass in an infinitely small space.
Explanation:
A gravitational singularity lies in the center of a black hole. A gravitational singularity is a one-dimensional point which contains a huge mass in an infinitely small space. In this infinitely small space, density and gravity become infinite and the laws of physics cease to operate.
