Why is an experiment called a controlled study?

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

What is the 77 element on the periodtic table