Which of the following statements are considered to be normal? a. normal heart rates vary from 30 beats/minute up to 200 beats/minute. b. a heart rate less than or equal to 60 beats/minute is called bradycardia. c. a heart rate greater than or equal to 100 or 120 beats/minute is called tachycardia. d. a person’s heart rate will change depending on the needs of the body. e. b, c, and d are all correct.

In cattle a single gene with two alleles determines fur color the fur can be red white or roan roan fur has both red and white hair which of the following statements is true a the allele for roan fur color is dominant over red and white fur color b the allele for red fur color is dominant over white and roan fur color c the roan and white alleles are expressed independently of the other d the red and white alleles are expressed independently of each other