Because these isotopes decay more slowly, they can be used to date much older specimens. Having read the above passage, choose the right answer to the following question (choices are less useful isotope? or more useful isotope ): For dating the age of a fossil, and compared to the isotope Carbon 14 with its 5730 year half-life, would Francium with a 22 minute half-life be a less useful isotope? or more useful isotope?
less useful isotope?

A sunscreen with a higher SPF value protects the skin longer. Having read the above passage, choose the right answer to the following question (choices are Shorter or Longer ): John was analyzing some of the results from his sunscreen study. He found that a higher SPF protects the skin Shorter or Longer?
Longer

Q: The more tightly packed the particles inside the material are, the more dense we say they are. Having read the above passage, choose the right answer to the following question (choices are less dense or more dense ): Sasha is throwing bottles into the lake. Some bottles are filled with sand, and some only have a tiny bit of sand in them. The bottles with a tiny bit of sand will sink last because they are less dense or more dense?
A: less dense

Question: This is also called diffusion, and the process is much faster in gases than in liquids, because the particles in gases are further apart. Having read the above passage, choose the right answer to the following question (choices are water or oxygen. ): Diffusion occurs slower in water or oxygen.?
Answer: water

*Question*
Increasing the number of resistors in a series circuit increases the overall resistance of the circuit. Having read the above passage, choose the right answer to the following question (choices are it will increase or it will decrease ): If Jim adds more resistors to the circuit he is building for his school science project, what will happen to the overall resistance of the circuit it will increase or it will decrease?
**Answer**
it will increase

(Question)
Smaller tributary glaciers, like tributary streams, flow into the main glacier in their own shallower U-shaped valleys. Having read the above passage, choose the right answer to the following question (choices are small or large ): Reid notices that tributary glaciers make U-shaped valleys when flowing. A small valley was likely caused by a small or large tributary glacier?
(Answer)
small