Elevation of the __________ pushes the glottis against the epiglotis, keeping food out of the esophagus.

The evolution and spread of grasses on Earth has been associated with what?

Carbon 14 degrades to form nitrogen and has a half life of 5730 years. As a single millenium (1000 years) passes, in a bone (which contains carbon isotopes in the proportions normally found on Earth), what should happen to the amount of Carbon 14 relative to the amount of Nitrogen over that time?

Which of the following is NOT a shared characteristic of all chordates?

Which of the following organisms has continual air flow across the surface of its lungs?

While snorkeling or skin diving, a student observes an active marine animal that has a series of muscular tentacles bearing suckers associated with its head. A pair of large, well-developed eyes are evident. The student is observing an animal belonging to the class:

An ancient archaic cell engulfed a cyanobacterium and allowed it to form a mutualistic relationship, because the cyanobacterium produced sugars that were usable by the archaic cell. The descendants of this archaic cell also inherited the cyanobacterial descendants of that first mutualistic cell, and thus were the first chloroplasts generated. This story describes a history of evolution which characterizes the ….

Lichens are a symbiote which involves a fungus that plays host to a….

Which statement about vertebrate circulatory systems is NOT true?

Your patellar ligament (which helps you raise and extend your lower leg as it attaches to your knee-cap and your tibia) is best categorized as what type of connective tissue?