The primary function of the is the transport blood carrying oxygen and nutrients to body tissues. a. circulatory system b. pulmonary circuit c. urinary system d. respiratory system

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Which statement about the pancreas is not true? a. it is an endocrine organ in the abdomen. b. it release chemicals into the digestive system. c. it releases insulin to increase glucose levels. d. it release hormones into the bloodstream.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.