Why would ten scientists all conduct the same experiment?
a. to validate the results of the experiment
b. to prevent bias
c. to collect more data
d. all of these

3test questions with answers on incomplete dominance

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

What kinds of molecules can pass through the cell membrane without any problem?