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In a population of birds, there is variation in beak size. Birds with small beaks are better at eating tiny seeds, while birds with large beaks are better at cracking hard, large seeds. Birds with medium-sized beaks, however, struggle to eat either type of seed effectively. Over time, the population begins to show an increase in the number of birds with either small or large beaks, while birds with medium-sized beaks become less common. Which type of selection is being displayed in this scenario?

What structure is the building block of proteins?

Given the following DNA strand:   3’ – AGA – GGG – CCC – AAA – AAT – GCA – 5’   What is the RNA strand?

What type of bond is exhibited when two water molecules are attracted to each other?

Which characteristic is unique to eukaryotic cells compared to prokaryotic cells?

If a cell is placed into a solution and water moves into and out of the cell at about the same rate, then it was likely placed into a…

Which organisms perform cellular respiration?  

What is the difference in an enzyme-mediated pathway and a non-enzyme-mediated pathway?  

Which scientist below did not contribute to the Cell Theory?

What part of a nucleotide connects to each other via hydrogen bonds from one strand of DNA to another?