The surface tension in a cup of water is caused by

a attractive forces between the water and its container

b attractive forces between water molecules

c adhesive forces between water molecules

d adhesive forces between the water and its container

What causes darkening of the skin as melanin production increases

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele