Jacob plays soccer and gets grass stains on his shorts. He uses several types of laundry detergent to try to remove the stains, but none of them work. He hypothesizes that laundry detergents are not able to remove grass stains from clothing. Which best describes the evidence that fails to support the hypothesis? 1. The stain is removed when a different type of laundry detergent is used.

2. The stain was not removed when several types of laundry detergent were used.

3. The stain does not go away after being repeatedly laundered in water with no laundry detergent.

4. The stain is removed when it is treated with a stain remover before it is washed using laundry detergent.

This term refers to the number of people per unit area (usually a kilometer or a mile). this could refer to the number of people per square mile in a city, a county, a province, a state, or a nation.

Afull irb committee meeting is convened and one agenda item is a new research proposal to evaluate how mothers interact with their learning-disabled child. the inclusion criteria require the children to be a minimum of five years of age. the protocol requires the mother of the child to look at the child without any expression and not to talk to the child for three minutes. the committee determined that the mother's required task may upset the child. the irb approved the study with appropriate language in the parental permission form regarding the possibility that children might become upset. after the start of the study, the principal investigator reports to the irb that, as expected, one of the children became upset. the incident was handled according to the protocol and the child is fine. what should the irb do with regard to this report?

Sailors went to special school to learn how to use the new technology that would them sail far distences. the school we know about was