To test for protein, you added biuret solution and observed color changes. suppose that the color data below was observed. sources of error the data above indicate an error. how do you know? what might have caused the error?

How can you keep track of variables in a science experiment?

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen