Which of the following is NOT an organ system in the human body? A. Endocrine system
B. Replicatory system
C. Digestive system
D. Lymphatic system

Which group of chordates does  notpossess true backbones?                 a.  birds      b.  frogs and toads      c.  lampreys      d.  crocodilians

What does gradualism and punctuated equilibrium have in common

The allele for curly hair is incompletely dominant. if a mother is homozygous for curly hair and the father is homozygous for straight hair, what percentage of the offspring will exhibit characteristics of both parents? 25 percent 50 percent 75 percent 100 percent