12. Competition can affect a population size.
a True
b. False

Why do we perceive objects as retaining their brightness under different lighting levels?

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

Darwin’s hypothesis about how life changes over time is now called?