A single celled organism such as the amoeba uses its cell membrane organelle to take in oxygen and remove carbon dioxide which organ system in humans has the same function as the cell membrane of the amoeba A. Digestive B. Nervous C. Circulatory D. Respiratory

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?

Consider the venn diagram of plant reproduction. where in this image, areas a - d, would you insert the picture of the orange lily?