There are more hydrogen atoms in living organisms than any other atom, but oxygen is more abundant in terms of mass
Why is this statement true?

The production of cells during mitosis into specialized function is recombination or differentiation

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?

Apart of an ecosystem that can restrict the growth of a population is referred to as