The legs of a shrimp are used for movement, while the legs of a barnacle are used to catch food. However, both are descended from the jointed legs of a shared ancestor. This is an example of..

Image credit: Manuae This organism has a shell made from a mantle, a visceral mass inside, and a foot divided into tentacles. It is bilaterally symmetrical and has three tissue layers. It does NOT have a jointed exoskeleton or a dorsal nerve cord. This organism is…

FINAL SURVEY: Which question/questions did you find easiest on this final? (1 pt) Which did you find hardest? (1 pt) Which aspects of this course, if any, were most helpful for your learning? (1 pt) Which aspects of this course, if any, were least helpful for your learning? (1 pt) Thank you for your hard work!

Which statement best describes what happens during Meiosis I?

What is the largest cause of prior and ongoing extinctions? (i.e., has caused and is causing the largest number of species to go extinct?)

How does spraying mosquitoes with insecticide eventually lead to insecticide resistance?

A plain is covered in a species of tall grass (primary producer). One primary consumer species eats the grass. One secondary consumer species eats the primary consumer. And one tertiary consumer species is at the top of the food chain. Which of these is the dominant species on this plain?

Although some families have higher risk of cancer, most cancers are NOT passed down from parent to offspring. Why not?

You find a four-legged animal on the shore of a pond. It has a backbone, and can breathe through its skin, but also has lungs. Its eggs are thin, lacking an amnion, and must be laid in the water. This organism is…

For any given ecosystem, which of the following trophic levels would take in the most TOTAL energy over the course of a year?