Jeremy decides to cook some pasta noodles. He notices that the directions say to add salt to the water before bringing the water to a boil. The next day, Jeremy asks his science teacher, Ms. Jackson, a question: “How
does adding salt affect the boiling temperature of water?” Of course, Ms. Jackson asks Jeremy to plan and
conduct an experiment to find the answer.
The following question is based on the experiment Jeremy does to find an answer.

Which of the following was the control variable for Jeremy’s experiment?
(1 point)
One quart of boiling water with salt added
One quart of boiling water with no salt added
One quart of room temperature water with salt added
One quart of room temperature water with no salt a

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?