Question 1 samal read a story about transforming a planet so that it resembles earth and can sustain life. the characters in the story wanted to create an artificial atmosphere on mars that closely resembled earth’s atmosphere. most of the story was fiction, but there was one detail about earth’s atmosphere that samal recognized as true. which detail about earth’s atmosphere is true? a. it has no effect on surface temperatures. b. it is thicker over places where there are high elevations. c. it allows meteors to strike the surface. d. it shields life forms on the surface from radiation.

Which description provides the best objective summary of the article in the passage?

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.