Which of these sentences is true with respect to species?

two organisms belong to the same species even if they are separated by a geographical barrier, as long as they can mate and produce sterile offspring.

two organisms belong to the same species even if they are separated by a geographical barrier, as long as they can mate and produce fertile offspring.

two organisms belong to different species if they are separated by a geographical barrier, even if they can reproduce and produce fertile offspring.

Which of the following is true of photosynthesis? a)carbon dioxide is a reactant b)water is a product c)most reactions within this process are exothermic d)oxygen is a reactant

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?

Me the formula cacl2 represents the compound