Cones are more common at the ______ of t...mon in the ________.

All of the following gymnosperms have atypical cones. [img=1009x765]1803b813da87f75.jpg[/img]

According to the passage, bats and adult owls cannot see colours ______ . A: because they hunt at night B: because they cannot see light C: because they have no cones and rods D: because they have no cones

【单选题】The perception of color is a function of the() A. cones on the retina and is diminished in dim ambient lighting B. rods on the retina and is diminished in dim ambient lighting C. cones on the retina and is diminished in bright lighting conditions

According to the passage, dogs and cats ______ . A: as well as human beings cannot see some colours B: have fewer cones than human beings C: have less rods than human beings D: can see colours as well as human beings