Use the Abbreviated Key to the Animal Kingdom below to key out this organism.  Select all steps that apply.  

Phenol red turns yellow when carbon dioxide is added because

Describe 2 distinct characteristics of Chondrichthyes.

In the experiment below, both test tubes were filled with 3% sodium bicarbonate solution and contained a plant. Test tube A (left) was left uncovered and test tube B (right) was wrapped in foil. The volume of oxygen gas was measured using the volumeter for both tubes. The starting volume oxygen in test tube A and test tube B was 2.7 mL.                     A           B    Both tubes were placed in the light for 24 hours.  After 24 hours, the volume of oxygen gas was measured in the tubes using the volumeter. The volume in tube A was 7.1 mL and in tube B was 2.4 mL.   [a] Which tube represents the control in this experiment? [b] Was oxygen used, produced, or not changed in tube A? [c] What process occurred in test tube A? [d] Was oxygen used, produced, or not changed in tube B? [e] What process occurred in test tube B?        

Use the Abbreviated Key to the Classes of Chordata to key out this organism. Select all key steps that apply.     

Use the Abbreviated Key to the Animal Kingdom below to key out this organism.  Select all steps that apply.    

Birds sometimes form partnerships with larger animals and use them as a source of insects and other items for food.

According to the pressure-flow hypothesis, sugars are pumped:

A condition in which an artery wall thickens as a result of the accumulation of fatty plaque; also known as “hardening of the arteries”:

A recording of electricity flowing through the heart: