Unlike eutherians, both monotremes and marsupialsa. lack nipples.b. have some embryonic development outside the uterus.c. lay eggs.d. are found in Australia and Africa.

Which of the following characteristics is not shared by extant birds and extant reptiles?

The opossum is an example of a(n) __________ mammal.

All mammals __________.

Which of the following is an archosaur group?

What two major lineages make up the living Amniota?

Which statement is true about endothermy in mammals and birds?a. They both inherited this trait from a common ancestor.b. Birds are more closely related to mammals than to reptiles.c. Endothermy arose independently in these two lineages.d. Birds are reptiles and all reptiles are ectothermic.

Compare amniotic eggs to placentas.

Suppose you are heterozygous for two genes that are located on different chromosomes. You carry alleles A and a for one gene and alleles B and b for the other. Be sure to list all the genetically different gametes that could form and indicate how frequently each type should be observed.