Which represents a theory?

I observed three stars in the sky. The stars give off light.

Light travels at 300,000 kilometers per second. Stars are balls of hot gases.

Why is breathing temporarily interrupted when you swallow?

Which statement correctly compares nucleic acids and carbohydrates? O O O They both contain phosphorus, but only nucleic acids contain hydrogen. They both contain carbon, hydrogen, and oxygen in a 1:2:1 ratio.

Darwin stated four conditions that are necessary for natural selection to occur. Which of these conditions is not fulfilled by Mycobacterium tuberculosis, the organism that causes tuberculosis?

Why might a cell make lots of rRNA but only one copy of DNA?

Which of the following is NOT a way that biodiversity is important to an ecosystem? Question 6 options: Biodiversity can increase the rate of extinction. Different types of decomposers are available to break down many types of waste.

Which animals were unable to adapt to warmer weather

Salt and water are mixed together in a bowl. The salt dissolves. The bowl of salty water is left out on a table. After a few days, you notice that the water is gone and that the bowl is covered in salt. What can you conclude? A.

When a Staphylococci species ferments mannitol on Mannitol Salt Agar, A. the Staphylococci cells turn yellow B. the Staphylococci colonies turn yellow C. the media around the Staphylococci colonies turns yellow

Which of these practices does the most to keep wind and water from Carrying away topsoil?

32. Explain why it is hard to classify organisms in Kingdom Protista? What are the definin characteristics of the kingdom?