Which is not an example of cell differentiation? a. a leaf cell divides as a plant leaf grows. b. a fertilized egg develops limbs and a head. c. stem cells from bone marrow develop into blood cells. d. bone marrow cells are used to repair damage to heart tissue?

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

Restless tectonic plates move (shift) between one and fifteen centimeters per year month day minute

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous