Where is the dna in a prokaryote?
a. nucleotides
b. nucleus
c. nucleoid region
d. nucleoid center

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of