Question

english language arts - 06yr
selection test (online): mission twinpossible
rawr
according to “mission twinpossible,” why are the kelly brothers perfect for nasa’s study?
a. they have both been to space, so they have experienced identical physical changes to their bodies in the past.
b. one twin has retired, so his body will likely show different physical changes than the twin who is still going to space.
c. they are biologically identical and are the same age, so differences in their bodies during the next year will likely be caused by space.
d. one twin has been on more missions that the other, so comparing them will help nasa determine the effects of space on the body.
part b
which sentence from “mission twinpossible” best supports the answer to part a?
a. but his brother, mark, knows the crackle of an extraterrestrial signal in his ear.
b. nasa needs subjects to test the long - term effects of space.
c. in a perfect experiment, every subject would have a control subject on earth with the exact same genes.
d. to the kelly brothers, it is just the latest mile in a journey they’ve shared for half a century.

Explanation:

For Part A, the Kelly brothers are perfect for NASA's study because they are identical twins (biologically identical), so differences in their bodies during the study can be attributed to space effects. Option C states they are biologically identical and same age, so differences next year (from space) can be studied.

For Part B, to support the answer in Part A (using identical twins to study space effects), we need a sentence about the experimental setup with a control (one twin on Earth, same genes). Option C says in a perfect experiment, every subject has a control on Earth with exact same genes, which supports using the Kelly twins (one in space, one on Earth as control) for the study.

Answer:

Part A: C. They are biologically identical and are the same age, so differences in their bodies during the next year will likely be caused by space.
Part B: C. In a perfect experiment, every subject would have a control subject on Earth with the exact same genes.