B. 245 million
from the end of Carboniferous Period to the beginning of the Triassic period
Answer:
Eye , Nose, Tongue , Ear, Skin
Answer: population density
Explanation:
A karyotype is an organized profile of a person's chromosomes. Two chromosomes specify sex, XX for female and XY for male. The rest are arranged in pairs, numbered 1 through 22, from largest to smallest. This arrangement helps scientists quickly identify chromosomal alterations that may result in a genetic disorder.
