What prevents a white dwarf from completely collapsing upon itself?
a) gravity
b)tightly packed protons
c)tightly packed neutrons
d) tightly packed electrons

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?

What pattern of migration do whales follow?

The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)