Actually science but no subject for thou
how is carbon dioxide exchanged between the biosphere and the atmosphere?
a. plants and animals remove carbon dioxide by cellular respiration, and plants release it by photosynthesis.
b. plants and animals release carbon dioxide by cellular respiration, and plants remove it by photosynthesis.
c. nitrogen-fixing bacteria remove carbon dioxide from the biosphere, and denitrifying bacteria release it into the atmosphere.
d. denitrifying bacteria remove carbon dioxide from the biosphere, and nitrogen-fixing bacteria release it into the atmosphere.

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

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 type of organism is a caterpillar