Circle the choice that gives the best evidence that a chemical reaction occurred. A. The molecules were separated into individual atoms.
B. The mass of the magnesium changed.
C. Smoke that was trapped between the magnesium atoms was given off.
D. A new substance was formed.

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

In water, a strong acid will break down into its component parts. a. completely b. partly c. never in water, a weak base will break down into its component parts. a. completely b. partly c. never