What features signifies to astronomers that a distant star is part of a planetary system

A) the star periodically dims

B) the star expands into a red giant

C) the star moves through the sky

D) the star continuously gets brighter

Could the mitochondrial DNA of either James Carnegie or Countess Xenia be used to try to identify the skeleton of Tsar Nicholas?

Which water source becomes polluted as it travels over Earth? Ponds groundwater oceans or Runoff

Hurricane that left more than million of people homeless in 2005

Explain why the gametes have only one allele for a trait

Fish are not able to regulate their body temperature by producing heat. How could a fish adjust its body temperature if it were too warm

In 1865, a biologist, St. George Jackson Mivart, constructed an evolutionary tree of existing primate species with many branches based on analysis of spinal columns. But to his dismay, another tree based on limb comparison was quite different.

How does the amount of rainfall affect the amount and types of seeds present on the Galapagos Islands?

If a characteristic is found in bacteria, fungi, pine trees, snakes, and humans, when did it most likely evolve?

Which property allows objects that do not produce their own light to be seen

What is an example of recombinant dna technology?