Cell Work Unit Test Cell Work Unit Test
Item
Which statement about chemical reactions is correct? (1 point)
Item
The number of substances before the chemical reaction always equals the number of substances
after the chemical reaction.
Item
Item 4
The number of molecules before the chemical reaction always equals the number of molecules
after the chemical reaction.
Item 5
Item 6
The number of atoms before the chemical reaction always equals the number of atoms after the
chemical reaction.
The number of energy bonds before the chemical reaction always equals the number of energy
bonds after the chemical reaction.

Florian discovers a rock that is broken into pieces. each piece has several bands. which type of rock does florian predict these pieces will change into when subjected to heat and pressure? igneous magma metamorphic sedimentary

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

What enzyme is most important for dna replication and why?