Please help with step by step instructions

Step-by-step explanation:

This is classic right triangle trig.  Let's identify the sides in this triangle according to the values they have been given.  The longest side and the side across from the right angle is always the hypotenuse, so the hypotenuse measures 12.  The side measuring 5 then is adjacent to the angle x.  The side across from it is one we do not need to know (but could solve for if we had to using Pythagorean's Theorem!).  The trig ratio that relates an angle to its hypotenuse and adjacent side is the cosine of the angle:

In order to find a missing angle on your calculator, you'll use the 2nd button and the cos button.  On your screen you'll see this:

 and after the parenthesis, enter in 5/12 and hit "enter" to get the angle.  It's 65.4 degrees.  If you didn't get that, check your calculator to make sure you're not in radian mode!!!

seems like d

step-by-step explanation:

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.