Which of the following is not true about mutations? a) mutations are chance changes in the dna sequence of bases and may code for a different amino acid b) mutations may cause variations that are adaptations c) radiation and x-rays may cause mutations d) mutations are always harmful

Were does condensation occur? a) hydroshereb) lithosherec) boishered) atmosphere

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

The disease osteoporosis often results from insufficient intake of dietary calcium salts. of the three samples of bone you tested in exercise 7-2, which is the most similar to the bones in osteoporosis