For a given medium such as air, sound has a slower speed at lower temperatures.  Mike wants his voice to travel slowly, so he will speak in a room that is colder or warmer?
colder


At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.  Ian sees an object with many colliding particles, and he compares it to another object with few colliding particles. Which is true about the objects the object with many colliding particles has a lower concentration of particles or the object with many colliding particles has a higher concentration of particles?
the object with many colliding particles has a higher concentration of particles


Q: The size of the eroded particles depends on the velocity of the water. Eventually, the water deposits the materials. As water slows, larger particles are deposited. As the water slows even more, smaller particles are deposited.  Fewer particles are deposited when a river's speed increases or decreases?
A: increases


Question: We also saw that adding resistors to a series circuit increases the total resistance of the circuit, causing the current to decrease.  Mike wants his circuits to be able to have a higher resistance, so that the current decreases. In order to do this, he will consider his resistors and increase them or decrease them?
Answer: increase them


*Question*
In general, fossils in older rocks are less similar to modern organisms.  Jimmy found a fossil on the beach. He compared it to a fossil in the museum that was much older. Which fossil resembles modern organisms the least beach fossil or museum fossil?
**Answer**
museum fossil


The larger the animal, the heavier the exoskeleton, making movement more difficult.  Ease of mobility increase or decrease when the animal is decreased in size?
increase