You've likely heard of polar bears (Ursus maritimus) and grizzly bears (Ursus arctos horribilis). Have you heard of a grolar bea
r or a pizzly bear? These might be unfamiliar because they are the offspring of matings between polar bears and grizzlies. A handful of these animals have been born in zoos: three have been documented in nature. Due to their rarity, only a few grolars (grizzly dad and polar bear mom) or pizzlys (polar bear dad and grizzly mom) have been studied in detail. Their fur color, head shape, and ear shape are striking intermediates between the phenotypes of their parents. It is thought that polar bears originated from a population of brown bears (Ursus arctos) that became geographically isolated during a glaciation event that occurred about 150,000 years ago (Lindqvist et al., 2010). Traditionally the territories of grizzly bears and polar bears did not overlap, as grizzlies ranged from Alaska to Mexico, whereas polar bears stayed on the annual sea ice over the Arctic continental shelf and within the Arctic archipelagos. Relatively recently (last 50 years or so) grizzlies and polar bears have begun to come in contact in the wild. Was the origin of polar bears an allopatric or sympatric speciation event? Briefly define both terms and explain your answer.
Buildup of organisms means that the species number is pretty high. Gradual change means that it was a slow, calm time to make the change. I hope this helps!!
The average adult, when resting, inhales and exhales about 7 or 8 liters of air per minute. That totals about 11,000 liters of air per day. Inhaled air is about 20-percent oxygen. Exhaled air is about 15-percent oxygen.
The correct answer of the question above is letter B. The exogenous DNA is inserted in the DNA of the bacteria.It is the process of combining exogenous DNA with bacterial cells that scientist used to <span> produce a desired protein. I hope I have answered your question.</span>
