How many chromatids are found in this nucleus? Six chromosomes in metaphase are shown. They resemble the letter X with red dots in the center.
A.
3

B.
6

C.
12

D.
24

Each chromosome has 2 chromatids so 2*6=C.12 chromatids

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

b. lithosphere, asthenosphere, mesosphere   is the answer most likely