Why do elements that are in the same group of the periodic table share similar properties? A. They all have the same number of electrons in the outer shell.
B. They all have the same atomic mass.
C. They are all metals.
D. They are all very reactive with other elements.

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?

Define adaptation. why do organisms adapt? give an example.

Conservationists to restore ecosystems. which activity will positively affect the abiotic conditions of an ecosystem?