The picture above shows four varieties of the same species of grass that grow in a prairie ecosystem. Which variety has the best chance of surviving a long period of dry weather?

A winter freeze killed all of the plants in a student’s garden. In the spring the student plants some new flowers in his garden. A couple of weeks later he is surprised because the daffodils he planted last year, and thought were dead, have started growing out of the soil. Daffodils are flowering plants that have a bulb. Explain how the daffodils survived when the other plants in the garden did not.

The blood in fish gills flows in the direction opposite to the way the fish swims, what is the purpose of this structural adaptation in fish?

Bird’s bones are hollow, while mammal bones are filled with marrow. What is the best explanation for the bird’s bone adaptation?

The xylem of plants is the highway for water and minerals movement. Over time plants have adapted to become more efficient at transporting water. Which of the following would be the most beneficial adaptation that plants could make to their xylem cells?

In the celery lab what structure did the blue dye use to get to the leaves?