What is the main purpose of controlled variables in an experiment
1. they compare the findings of one experiment to another
2. they produce reliable results without repeating the experiment
3. they investigation practice measuring without affecting the results of the experiment
4. they ensure that changes in the independent variable are affecting the dependent variable

The transport tubes from food came down the plant are called?

Identify the examples in which sam interacts only with natural resources

This patient undergoes a gallbladder sonogram due to epigastric pain. the report indicates that the visualized portions of the liver are normal. no free fluid noted within morisons pouch. the gallbladder is identified and is empty no evidence of wall thickening or surrounding fluid is seen there is no ductal dilation. the common hepatic duct and common bile duct measure 0.4 and 0.8 cm respectively. the common bile ductmeasurement is at the upper limits of normal what cpt code in icd-10 cm code was used