Explain why the bright spectral lines of light emitted from the atoms of an element are unique to that element

List two diseases of the muscular system.

An organism that contains many cells is correctly known as a multitissue organism multicellular organism multiple cell organism several cell organism

The energy in a wave travels a) up and down b) backward c) forwards d) waves do not carry energy

Which of the following statements about protostars is true? A) Protostars do not always become stars. B) Protostars never become stars. C) Scientists do not yet know if protostars ever become stars. D) Protostars always become stars.

What does the troposphere protect us from?

Scientists who study races and their origins are called A. anthropologists. B. ethnologists. C. paleontologists. D. sociologists.

Why are telescopes that detect non - optical radiation useful for studying objects in space

Which of the following is not an application of Doppler technology? police speed guns weather radar ultrasound imaging of the liver determining the motion of a star

For a constant voltage, increasing the resistance will cause the current to decrease. true or false

Which of the following is an example of a testable scientific hypothesis? A) Why do plants grow better in the Sun than in the shade? B) Peacocks have prettier tail feathers than pigeons do.