In terms of natural selection, what is the best description of an organism that is fit?

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

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins