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The experiment, conducted by exobiology students at the University of Washington and enabled by the replication of Martian soil, was a follow-on to earlier NASA challenges, for asking researchers to show that earthworms could live in highly alkaline environments.
a. was a follow-on to earlier NASA challenges, for asking
b. were follow-ons to an earlier NASA challenge, which asked
c. were follow-ons to an earlier NASA challenge, for
d. was a follow-on to an earlier NASA challenge, for
e. was a follow-on to an earlier NASA challenge, which asked
OA E
Source: Veritas Prep
a. was a follow-on to earlier NASA challenges, for asking
b. were follow-ons to an earlier NASA challenge, which asked
c. were follow-ons to an earlier NASA challenge, for
d. was a follow-on to an earlier NASA challenge, for
e. was a follow-on to an earlier NASA challenge, which asked
OA E
Source: Veritas Prep
