Which statement best describes cancer cells? They grow as a single layer of cells. They cease to reproduce after 20–50 mitotic divisions. They reproduce only when needed to replace missing cells. They are not regulated by contact inhibition..

Which of the following would most likely be key to gathering evidence that the rna world hypothesis is valid? creation of suitable environments for long-term study of single-celled organisms simulation of early earth conditions and long-term study of the resulting molecules development of a system for studying the microsphere's ability to absorb additional molecules categorization of the different specific conditions that result in the development of microspheres

Which of the following is a cost of urbanization? a-cities can provide a high standard of living. b-cities are hubs of entertainment and education. c-paving over land changes the environment. d-job opportunities are greater in urban centers.

Where is energy trapped inside the organelle chlorophyll