The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead. Which of the following is a controlled variable in this experiment?

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

Ais a group of individuals of the same that exist together in the same place at the same time

Color blindedness is a sex-linked trait. if we could see the pedigree chart for several more generations of the family illustrated here, we would expect a) more males to be color blind. eliminate b) more females to be color blind. c) no females to ever be color blind. d) an equal number of males and females that are color blind.