What are two things that characterize a biome

A student is working with four different solid substances: sodium (Na), calcium (Ca), copper (Cu), and iodine (I). Which substance is most likely to break easily into many smaller pieces?

Which of the following is a consequence of using fossil fuels as an energy source? A. decreased carbon dioxide levels B. increased biodiversity C. increased acid rain D. decreased ecosystem disruption

Indicate whether the statement is true or false. an astronaut weighs the same on earth as in space. a. true b. false

Which of the following is not a symptom of over training a. insomnia b. slow healing rate c. increased competitiveness d. loss of appetite

How is a crime scene secured?

All light waves move through a vacuum with a constant speed. True or False

A simple pendulum has a period of 1.0 s. If you take this pendulum to Mars where the acceleration of gravity is 3.8 m/s2, what will the period of the pendulum be

If f (x) = 27+1, what is f/x) when x = 3? 1

Approximately how much of Earth's water is freshwater? 1 % 3 % 97 % 50 %

How radio wave carry information?