Which of the following is an example of how a scientist might use a model?
question 5 options:
stopwatches measure the amount of time it takes for a swimmer to go one lap in the pool.
a saw is used to cut a board in half.
marbles placed inside a hollow sphere are used to describe protons in a nucleus.
a telescope is used to see the moons orbiting jupiter.

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.

When are the centromeres broken in meiosis?

Which of the following describes research that would be considered basic science? a. a farmer is trying to improve his crop yields by using a new kind of fertilizer. b. a college students is curious about the growth of desert pants in the presence of excess amounts of water. c. government officials are trying to prevent the spread of new strain of influenza virus. d. a doctor is trying to determine why a patient is feeling tried and sick. b.a college students is curious about the growth of desert pants in the presence of excess amount of water