If Mammalia is considered as the crown group, its origin can be roughly dated as the first known appearance of animals more closely related to some extant mammals than to others. Ambondro is more closely related to monotremes than to therian mammals while Amphilestes and Amphitherium are more closely related to the therians; as fossils of all three genera are dated about 167 million years ago in the Middle Jurassic, this is a reasonable estimate for the appearance of the crown group. The earliest known synapsid satisfying Kemp's definitions is Tikitherium, dated 225 Ma, so the appearance of mammals in this broader sense can be given this Late Triassic date. In any case, the temporal range of the group extends to the present day.
Which two groups are closely related to therian mammals?
Amphilestes and Amphitherium

In 1976, contemporaneously with Woodson and Roberts, the Court decided Gregg v. Georgia and upheld a procedure in which the trial of capital crimes was bifurcated into guilt-innocence and sentencing phases. At the first proceeding, the jury decides the defendant's guilt; if the defendant is innocent or otherwise not convicted of first-degree murder, the death penalty will not be imposed. At the second hearing, the jury determines whether certain statutory aggravating factors exist, whether any mitigating factors exist, and, in many jurisdictions, weigh the aggravating and mitigating factors in assessing the ultimate penalty either death or life in prison, either with or without parole.
Along with aggravating factors, what other factors are considered at the second hearing?
mitigating

Oda Nobunaga made innovations in the fields of organization and war tactics, heavily used arquebuses, developed commerce and industry and treasured innovation. Consecutive victories enabled him to realize the termination of the Ashikaga Bakufu and the disarmament of the military powers of the Buddhist monks, which had inflamed futile struggles among the populace for centuries. Attacking from the "sanctuary" of Buddhist temples, they were constant headaches to any warlord and even the Emperor who tried to control their actions. He died in 1582 when one of his generals, Akechi Mitsuhide, turned upon him with his army.
Who used arquebuses a lot?
Oda Nobunaga