What is the single-stranded nucleic acid that contains the sugar ribose?

What law states: in undisturbed rock layers, the oldest rocks are on the bottom and the youngest rocks are on the top?

What is the term for a fossil that is useful for dating and correlating the strata in which it is found?

What is the double-helical molecule that carries the hereditary information of the cell?

What is the process by which hydrogen atoms join together to form helium, releasing energy?

What is cell without a nucleus?

What is a scientist who studies fossils to learn about organisms that lived long ago?

What is the middle era of Earth's geological history; reptiles were dominant?

What are atoms of the same element that differ in the number of neutrons they contain called?

What is the geologic era with the first signs of life?

What is the process of adapting to something, such as environmental conditions?

What is the actual the number of years that have passed since the rock formed known as ?

What is the warm, moist climate zone near the equator?

What is the layer of gases that surrounds Earth known as?

When sediment deposited into water will settle at the bottom in flat, horizontal layers, this is known as which scientific law?

What is a cell that contains a nucleus and membrane bound organelles?

What is the study of rock layers and the sequence of events they reflect?

What is era that began about 66 million years ago, known as the "Age of Mammals" the current geologic era?

What is one form of radiometric dating used to find the age of dead organisms thousands of years old?

What is it called when living material is replaced with mineral substances in the remains of an organism?

What is the spontaneous process in which unstable nuclei lose energy by emitting radiation?

Identify the gas phase of water.

During what era did the oldest known rocks form?

How is the age of rocks determined by using the rate of decay of radioactive isotopes?

The law that states rock layers continue out to the side in all directions...

What is a sedimentary layer or rock that serves as a time marker in the rock record?

What is the age of a rock compared to the ages of rock layers known as?

What is the gradual change in a species over time know as?

What is a gap in the sequence of rock layers?

What is the eon where fossils of eukaryotic cells appear?

What is a term for an ancient landmass which separated into present-day continents?

What is the standard method used to divide the Earth's long natural history into manageable parts?

What law infers that a rock body cutting through another rock body is younger than the layers it intrudes?

What is any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences or by the effect of environmental factors?