Which is NOT a method used to extract stem cells? retrieval from blood donations
retrieval from embryos
retrieval from umbilical cords
retrieval from bone marrow

How had the study of mitosis affected scientists knowledge of cancer

Why do mutations in genes affect traits? o a. genes determine what type of mutagens an organism has. o b. genes produce proteins that cause traits. o c. genes affect how many chromosomes an organism has o d. genes code for carbohydrates that influence traits.

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels