Mitochondria are thought to have evolved from prokaryotic cells that were ingested by an ancestral cell. Which feature have the prokaryotes lost during
their evolution into mitochondria?
A) circular chromosome
B) cell wall
C) endoplasmic reticulum
D) ribosomes

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen