Question

Which statement describes an experimental procedure a scientist could have

conducted that is properly controlled?
A. An online poll gathers information about which indoor houseplant
is the easiest to maintain.
B. The weights of laboratory mice are measured each day for six
weeks.
C. Twenty tadpoles are exposed to a pesticide, and after three weeks,
the same 20 tadpoles are exposed to a different pesticide.
D. Fifteen pumpkin plants are grown in sunlight, another 15 pumpkin
plants are kept in darkness, and their stem lengths are measured
after three weeks.

Answer 1

D. Fifteen pumpkin plants are grown in sunlight, another 15 pumpkinplants are kept in darkness, and their stem lengths are measuredafter three weeks.

Step-by-step explanation:

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