What is noise pollution? Noise that is not heard
Extra noise we hear
Noise from a tea kettle
Noise that only animals can hear

Transpiration is the evaporation of water from

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

The organelle pictured is found in cells of and is theorized to have once been an independent organism.