Experiment 1: Huntington's disease is believed to be a dominant genetic disorder that causes brain damage over time. Test results from children of individuals that were known to be heterozygous for Huntington's disease were tested for the disease. The following observed results were collected:
Huntington's Disease (Hh) Normal (hh)
346
402
Perform a chi-square test to determine whether these results support that Huntington's is a dominant disease.

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water