Curated OER
Multiple Alleles
Students observe models of the ABO blood system including erythrocytes, antigens, and antibodies. They investigate the antigens that result from certain allele combinations and move antibodies to determine whether agglutination occurs...
Biology 4 kids
Biology4 Kids: Quiz: Circulatory Systems
Take this ten-question review quiz over the circulatory systems of animals. Read more about each question after an incorrect answer is given.