Arctic terns nest in the Tundra in shallow scraped out depressions on the open ground. The depressions are lined with a small amount of dead plant matter such as grass. What is described?

habitat

competition

niche

grazing

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

What organelle other than the nucleus houses dna in a eukaryotic cell?

Suppose you are provided with an actively dividing culture of e. coli bacteria to which radioactive thymine has been added. what would happen if a cell replicates once in the presence of this radioactive base?