Each molecule of ammonia (NH3) is made up of one nitrogen atom and three hydrogen atoms. Which term best describes ammonia? A. heterogeneous mixture

B. element

C. homogeneous mixture

D. compound

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

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

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?