The lakes of northern minnesota are home to many similar species of damselflies of the genus enallagma that have apparently undergone speciation from ancestral stock since the last glacial retreat about 10,000 years ago. sequencing which of the following would probably be most useful in sorting out evolutionary relationships among these closely related species?
a) nuclear dnab) mitochondrial dnac) small nuclear rnad) ribosomal rnae) amino acids in proteins

Are produced in the light reactions and used in the calvin cycle. a)nadh and atp b)electrons and sugar c)nadt+ and adp d)sugar molecules

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

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase