A tree of life depicting the hypothetical phylogeny of the three domains is shown above. A star is placed at the common ancestor of all eukaryotes. Which characteristic would a common ancestor located at the star contain? (See picture)

CHOICES: A- linear chromosomes with introns
B- circular chromosomes with introns
C- linear chromosomes lacking introns
D- circular chromosomes lacking introns

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these

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.

Which of the following is an abiotic factor in an ecosystem? a. bacteriab. airc. niched. grass(abiotic=non-living) me !