How many covalent bonds can nitrogen have? a. 0 c. 2 b. 1 d. 3

Developed over 100 years ago, Koch's postulates is no longer used to determine etiologic agents of human infectious diseases. True False

Which experiment should be conducted as a field investigation?

A 19-year-old male was stung multiple times by fire ants. He is experiencing obvious signs and symptoms of anaphylactic shock. You administer high-flow oxygen and give him epinephrine via intramuscular injection.

Which of the following is true about scientific knowledge? It never changes. It is durable. It is based on opinion. It is untested.

Evolution is a theory because A. we are not sure if it is true B. there's not enough evidence yet C. scientific theories are supported by a large amount of evidence D. none of these is true

What is a real life example of ecosystem

Molds and mushrooms are both

What is the Hubble space telescope?

In sequential test, there is typically a loss in specificity. a. True b. False

What is a scientific theory based on