The shape of dna is called a

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above