Which statement best describes why carbon is the key element in organic compounds?
carbon is extremely reactive and must form bonds for stability.
carbon is the most abundant element in the universe.
carbon is the least reactive element on the periodic table.
carbon has a strong tendency to form chains or rings.,

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?

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

Drag the tiles to the correct boxes to complete the pairs. match each cell organelle with its description.