What is the broadest level of biological classification?

Which domains contain only prokaryotic organisms?

Which domain includes organisms that live in extreme environments such as hot springs or high-salt areas?

Which domain includes organisms with membrane-bound organelles?

What do we call organisms that can make their own food using sunlight or chemicals?

Which kingdom includes organisms that absorb nutrients from decaying material and have cell walls made of chitin?

Viruses contain genetic material. What important structure do they lack that all cells have?

What traits do the cat and wolf have in common?

What type of evidence can scientists use to compare evolutionary relationships at the molecular level?

Which type of evidence most strongly supports the endosymbiotic theory?