What type of galaxy has only old stars, little to no gas and dust, and no star formation?

A. spiral galaxies
B. irregular galaxies
C. elliptical galaxies
D. All types of galaxies share these features.


Answer: C

Environmental & Atmospheric Sciences

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The ecological efficiency of herbivores and carnivores is estimated by most authorities to be roughly ____

a. 1 percent b. 10 percent c. 30 percent d. 60 percent e. 90 percent

Environmental & Atmospheric Sciences

Malaria cannot be transmitted by blood transfusions or by sharing needles

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

Which of the following is not an effect of friction?

A) slows airflow B) increases the Coriolis effect C) causes airflow to cross isobars rather than run parallel to them D) none of the above

Environmental & Atmospheric Sciences

The most well-developed sense in marine birds is ________.

A. smell B. touch C. sight D. taste E. hearing

Environmental & Atmospheric Sciences