What group of mammals have (a) embryos that spend more time…

What group of mammals have (a) embryos that spend more time feeding through the placenta than the mother’s nipples, (b) young that feed on milk, and (c) a prolonged period of maternal care after leaving the placenta? A) Eutheria B) Marsupiala C) Monotremata  

At times, several hominin species coexisted. These species o…

At times, several hominin species coexisted. These species often differed in skull shape, body size, and diet (as inferred from their teeth). Ultimately, all but one lineage—the one that gave rise to Homo sapiens—ended in extinction. Overall, considering the characteristics of all hominins that lived over the past 6.5 million years, H. sapiens appears not as the end result of a straight evolutionary path, but rather as the only surviving member of a highly branched evolutionary tree.