A student proposed a model of the classification of living things where all organism that contain a cell wall were placed in one group while those organism that did not have the cell membrane surrounded by a cell wall were placed into a separate group . Which statements correctly judges the proposed model by the student correctly.

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

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone