What is structure 2, and how does it sustain life?
a.
structure 2 is a chloroplast, which is the site of photosynthesis.
b.
structure 2 is the nucleus, which serves as the control center of the cell.
c.
structure 2 is the cell membrane, which controls what enters and leaves the cell.
d.
structure 2 is the cytoplasm, which contains organelles and is the site of many cell processes.

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?

What enzyme is most important for dna replication and why?

The structure of a dna molecule is best described as a. one long strand of nucleic acids b. two strands of dna nucleotides joined by hydrogen bonds c. two strands of amino acids joined by hydrogen bonds d. one long strand of amino acids