What two pieces of information would you need in order to measure the masses of stars in an eclipsing binary system? (a) the time between eclipses and the average distance between the stars (b) the period of the binary system and its distance from the sun (c) the velocities of the stars and the doppler shifts of their absorption lines?

Malthus studied limited resources and the impact of limited resources on human populations. how did these ideas contribute to darwin's ideas? a. limited resources in an environment means that the individuals of a species cooperate so that all individuals survive. b. limited resources in an environment forces some individuals to survive without food. c. limited resources in an environment means that not all individuals of a species will survive or reproduce at equal rates. d. limited resources in an environment forces more genetic changes in individuals, allowing the species to evolve more quickly.