Aids is spread primarily through:
a. blodd transfusion
b. sexual contact
c. casual contact
d. shared needles

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.

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis

How many copies of genes do gametes have?