What cellular mechanisms caused short-term changes in gene expression of red blood cells

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 causes darkening of the skin as melanin production increases

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?