Scientists have developed a new drug known to cure a previously incurable disease. what best explains if the new drug is a compound or not? a. it is a compound because it will be able to cure a disease. b. it is not a compound because it was developed by scientists. c. it is a compound because compounds make all types of matter. d. it is not a compound because compounds make up only living things.

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

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.

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a