The ancient Greeks used lunar eclipses as evidence that Earth is round and not flat. Why?

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic