What is the layer of soil in polar tundra that is always frozen is called

While examining a layer of rock, a scientist found a fossil of a trilobite like the one shown below. The scientist knows that trilobites only lived during the Paleozoic era.

A nurse is assessing available support systems for a client in the community mental health clinic. the client is divorced, has no siblings, and both parents died last year.

Type the correct answer in the box. A humming bird flits from flower to flower. Over a period of 10 minutes, it travels 40 meters. The average speed of the humming bird is m/min.

What types of carbon based molecules are the source for most of the energy in the foods you eat what energy is stored in these molecules?

Which best describes the process of conduction?

Transport of materials into a cell against a concentration gradient, from low to high, requires A) water. B) energy. Eliminate C) osmosis. D) a passageway.

As ocean water in a tide pool warms and evaporates, the remaining water becomes a. cooler. b. saltier. c. calmer. d. darker.

Drake is comparing time people spend playing games on Xbox versus Playstation. In his study, individuals ages 10 - 15 are given Xbox's and individuals ages 16 - 25 are given Playstations.

How do scientists obtain knowledge about the world? Check all that apply.

What would the temperature of the surface be if the Earth did not have an atmosphere?