Which of the following statements about stellar parallax is true?
a. we observe all stars to exhibit at least a slight amount of parallax.
b. stellar parallax was first observed by ancient greek astronomers.
c. the amount of parallax we see depends on how fast a star is moving relative to us.
d. the closer a star is to us, the more parallax it exhibits.
e. it takes at least 10 years of observation to measure a star's parallax.

Select the correct text in the passage. the moving continents affect all subsystems on earth. which sentence identifies a potentially negative consequence of shifting continents? the supercontinent pangaea began to break up about 175 million years ago. [during this process, more coastline was exposed as the landmasses separated]. [the rearrangement and displacement of these huge landmasses resulted in the diversity of plants and animals we see on earth today]. [the movement of the plates sometimes leads to earthquakes and tsunamis]. however, over the long course of earth's history, their effects are usually minimal. in oceans, the plate movements usually lead to seafloor spreading. [seafloor spreading often results in the formation of underwater ranges of mountains].