In the 1940s and 1950s, scientists did experiments to determine the molecule responsible for heredity. their experiments demonstrated that the molecule that encodes and transmits information in organisms is
a. dna.
b. glucosamine.
c. insulin.
d. vitamin d.

Ineed to know why d is the correct answer asap

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.