Which technique is used to help reduce experimenter bias?
A) Create experiments that are reproducible and repeatable.
B) Control extraneous variables as much as possible.
C) Include a control group in your experiment.
D) Be aware of potential placebo effects.
E) Keep the experimenter blind to the conditions in an experiment or its purpose.
E) Keep the experimenter blind to the conditions in an experiment or its purpose.
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Sperm cells form within a rounded structure called ____ in bryophytes and some other plants
a. antheridium b. stoma c. strobilus d. sporangium e. archegonium
Rods and cones are located in the
a. lens. b. cornea. c. pupil. d. iris. e. retina.
Which of the following could not be considered a secondary tissue?
a. xylem b. phloem c. epidermis d. periderm e. cork
The chances of guessing the right answer to this question are
A. 1/1. B. 1/2. C. 1/3. D. 1/4.