Which of the following is one reason that quartz is classified as a mineral? A
It has a chemical formula and a specific crystal structure.

B.
It can be melted at high
temperatures.

C.
It comes in many different colors.

D.
It can be manufactured in a laboratory.

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

What is the difference between an igneous, sedimentary and metamorphic rock

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind