Match the following phases of stellar evolution to its characteristic. black hole
red giant
black dwarf
brown dwarf
white dwart
does not undergo hydrogen fusion
has an outer shell of burning hydrogen
and a core of hellum
a white dwarf that has lost all its energy
has a core of carbon that is not massive
enough to fuse
>
formed from the collapse of a white dwarf beyond 1.5 solar masses

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.