What is the primary hypothesis for the extinction of large mammals such as mammoths?
hunting by humans
break-up of pangaea
climate changes
diseases

Two critical interventions to turn around the opioid crises are:

The cluster of developing cells from conception until birth is called an

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?