The era of "ancient life" is known as the
o paleozoic
o precambrian
o mesozoic
o cenozoic

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

How can active reading strategies you? o a. they can you get into better physical shape. o b. they can you read fewer science articles. o c. they can you understand what you read. o d. they can you avoid reading altogether.

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.