The ability of a person to roll his or her tongue is dominant in the human population. A person who is heterozygous for tongue-rolling would have all of the following except__. A. The ability to roll his or her tongue.
B. One dominant allele and one recessive allele
C. A genotype that would be written Tt.
D. A phenotype that is recessive.

The tar in the la Brea Tar is a fossil fuel That started forming hundreds of years ago from the organisms that was present in the marine ecosystem. During the last ice age that is few thousands of years ago, mammals like sabertooth cat and mammoths got trapped in the tar. Only bones were left behind in the tar. The mammals in this case became trapped that already existed, and they not in fact part of what created it.