The cladogram above diagrams the evolutionary history of chordates. Which structural adaptation led to greater motion and a more diverse diet?

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

Twind is considered to be an abiotic factor because it.?

What best explains the inability for life to exist in earth early atmosphere