Giraffes with short necks lived in arid regions. over time, grasses disappeared, forcing giraffes to eat from trees. mutations in the genome led to some giraffes inheriting the trait for long necks. over time, there were more giraffes with long necks in the region. what are the two reasons for the change in the population of giraffes?

- adaptation

- natural selection

Explanation:

From the example of the Giraffes you can read that adaptation you can see that tehy adapted the lenght of their nexk in order to be able to reach food that was only available in the trees, so they had to make their necks longer, and then the giraffes that had the longest necks were the ones that were able to survive and get food, so they passed that treat to their offspring and with time only giraffes with longer necks were able to feed themselves, that´s natural selection.

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

hope it

passive transport is a movement of biochemicals and other atomic or molecular substances across cell membranes without need of energy input. unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy.

so, according to what that says, i believe it's hypertonic and hypotonic.

good luck!