Which protein source is complete?
a. milk or meat
b. soy beans
c. peanut butter
d. red beans and rice

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight

Why do we perceive objects as retaining their brightness under different lighting levels?