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Quartz can scratch a steel file. This observation refers to the mineral’s

What causes the most common chromosomal abnormality, called Trisomy 21?

Which of these features is a required characteristic of minerals?

This question is worth 3 multiple choice questions and contains two parts (partial credit possible).  In complete sentences answer: Part 1: What is weathering? Part 2: Explain the difference between chemical and physical weathering.  

Two minerals—alabandite and pyrolusite—are both black, but alabandite is green in its powdered form, whereas pyrolusite is black in its powdered form. A geologist would say that they differ in

Minerals are grouped into classes primarily on the basis of

Which type of atomic bond creates minerals that are highly conductive because electrons can move freely?

Researchers conducted an experiment to study the effects of sleep training on sleep duration and quality. They randomly assigned some participants to a treatment condition where they received eight sessions of sleep enhancement training and some participants to a control condition where they did not receive the training. If the participants who received sleep enhancement training had better sleep duration and quality than the people who did not receive the training, then the researcher can conclude that the training works. What advantage of experimental research does this demonstrate?

How do the chromosomes contained in a gamete differ from the chromosomes contained in other normal human cells?

In the diagram, which letter label indicates an epicenter?