In an experiment, a culture of Euglena is placed in a petri dish, and a piece of cardboard with a circle cut
out of its center is placed over the petri dish, allowing light to enter only the center of the petri dish.
After 30 minutes, the cardboard is removed, and the culture is observed.
Which of the following BEST describes the appearance of the Euglena culture after the 30 minutes?

answer: 4

explanation: 8

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.

a compound light microscope is used to magnify objects in steps.  

hope it