New genetic combinations are a result of a. Nondisjunction
b. Crossing over
c. accidents
d. all of the above

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

What is the approximate time of death of the body temperature is 29.4 degrees celsius

Where does the information about where each transcription factor binds originate?