Which of the following statements about chemical properties is true? (S8P1c) A
They can be observed when the identity of a substance changes.

B
They vary based on sample size.

C
They can always be observed without changing the identify of a substance.

D
They are easier to observe than physical properties.

What are the characteristics of living things

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?

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates